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Example 10 There seem to have been caught several fish./There seem to have been several fish caught./There seem several fish to have been caught. (Chomsky 2001:17)
Initial Stream: ['fish', 'n_pl_3rd', 'several', 'catch', 'v', 'Psv', 'Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2
Successful Derivation 3
Successful Derivation 4
Successful Derivation 5
Successful Derivation 6
Successful Derivation 7
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Successful Derivation 9
Successful Derivation 10
Successful Derivation 11
Successful Derivation 12
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Successful Derivation 16
Successful Derivation 17
Successful Derivation 18
Successful Derivation 19
Successful Derivation 20
Successful Derivation 21


Merge 1
Merge: set-Merge
Stream: ['several', 'catch', 'v', 'Psv', 'Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['catch', 'v', 'Psv', 'Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v', 'Psv', 'Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: ['Psv', 'Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 5
Merge: set-Merge
Stream: ['Perf', 'toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 6
Merge: set-Merge
Stream: ['toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (toT,Psv)
Checked Features: 'uPerson'
Unlabeled:


Merge 8
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 9
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 10
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 11
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 12
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 13
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
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Label from
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Label from
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Label from
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Label from
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Label from
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Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 12

Merge 14
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 15
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
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Label from
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Label via
movement:

Label from
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Label from
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Label from
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Label from
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Label from
Head:

Label from
Head:

Transfer:
Frontier:

Terminals: C n there T(Pres,3rd,pl) v seem toT have -en be -en v catch several n fish
Externalization
Rules:
there T(Pres,3rd,pl)+seem
there seem to have -en+be
there seem to have been -en+catch
there seem to have been caught several fish

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 11

Merge 16
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 17
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 18
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 19
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Label from
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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 18

Merge 20
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 21
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 9

Merge 22
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 23
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 24
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 25
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 26
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 25

Merge 27
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 28
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Label via
shared Person:

Label from
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Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 24

Merge 29
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 30
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 31
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 32
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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movement:

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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 31

Merge 33
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 34
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label via
shared features:

Label from
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movement:

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Label from
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Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 8

Merge 35
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 36
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 37
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 38
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 39
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 40
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #10
Continued from Merge 39

Merge 41
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 42
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Label via
shared Person:

Label from
Head:

Label from
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Label from
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Label via
movement:

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Label from
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Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #11
Continued from Merge 38

Merge 43
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 44
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 45
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 46
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Label from
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Label from
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movement:

Label from
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Label from
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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 45

Merge 47
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 48
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
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Label from
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Label from
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Label from
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movement:

Label from
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Label from
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Label from
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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 36

Merge 49
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 50
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 51
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 52
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 53
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Label from
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movement:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #14
Continued from Merge 52

Merge 54
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 55
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Label via
shared Person:

Label from
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Label from
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Label from
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movement:

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Label from
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Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 51

Merge 56
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 57
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 58
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 59
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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movement:

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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #16
Continued from Merge 58

Merge 60
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 61
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label via
shared features:

Label from
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Label from
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Label from
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Label from
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Label via
movement:

Label from
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Label via
movement:

Label from
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Label from
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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #17
Continued from Merge 7

Merge 62
Merge: set-Merge
Stream: ['seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 63
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 64
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 65
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 66
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 67
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 68
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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Label from
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Label from
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Label via
shared Person:

Label from
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Label from
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Label from
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Label from
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Label from
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Label from
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Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #18
Continued from Merge 67

Merge 69
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 70
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
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Label via
movement:

Label from
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Label via
shared Person:

Label from
Head:

Label from
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Label from
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Label from
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Label from
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Label from
Head:

Label from
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Transfer:
Frontier:

Terminals: C n there T(Pres,3rd,pl) v seem several n fish toT have -en be -en v catch
Externalization
Rules:
there T(Pres,3rd,pl)+seem
there seem several fish to have -en+be
there seem several fish to have been -en+catch
there seem several fish to have been caught

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #19
Continued from Merge 66

Merge 71
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 72
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 73
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 74
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Label from
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Label from
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Label from
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Label from
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Label via
movement:

Label from
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Label from
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Label from
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Label from
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Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #20
Continued from Merge 73

Merge 75
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 76
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
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movement:

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Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #21
Continued from Merge 64

Merge 77
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 78
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 79
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 80
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 81
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Label from
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movement:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #22
Continued from Merge 80

Merge 82
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 83
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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shared Person:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #23
Continued from Merge 79

Merge 84
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 85
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 86
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 87
Merge: set-Merge
Stream: []
Unlabeled:
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #24
Continued from Merge 86

Merge 88
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 89
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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shared features:

Label from
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Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #25
Continued from Merge 63

Merge 90
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 91
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 92
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 93
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 94
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 95
Merge: set-Merge
Stream: []
Unlabeled:
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #26
Continued from Merge 94

Merge 96
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 97
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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shared Person:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #27
Continued from Merge 93

Merge 98
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 99
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 100
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 101
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #28
Continued from Merge 100

Merge 102
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 103
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #29
Continued from Merge 91

Merge 104
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 105
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 106
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 107
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 108
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #30
Continued from Merge 107

Merge 109
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 110
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #31
Continued from Merge 106

Merge 111
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 112
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 113
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 114
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #32
Continued from Merge 113

Merge 115
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 116
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #33
Continued from Merge 6

Merge 117
Merge: set-Merge
Stream: ['toT', 'seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 118
Merge: set-Merge
Stream: ['seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


Merge 119
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 120
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 121
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 122
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 123
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 124
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #34
Continued from Merge 123

Merge 125
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 126
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #35
Continued from Merge 122

Merge 127
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 128
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 129
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 130
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #36
Continued from Merge 129

Merge 131
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 132
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #37
Continued from Merge 120

Merge 133
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 134
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 135
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 136
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 137
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #38
Continued from Merge 136

Merge 138
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 139
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #39
Continued from Merge 135

Merge 140
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 141
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 142
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 143
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #40
Continued from Merge 142

Merge 144
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 145
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #41
Continued from Merge 119

Merge 146
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 147
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 148
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 149
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 150
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 151
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #42
Continued from Merge 150

Merge 152
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 153
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #43
Continued from Merge 149

Merge 154
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 155
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 156
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 157
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #44
Continued from Merge 156

Merge 158
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 159
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #45
Continued from Merge 147

Merge 160
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 161
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 162
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 163
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 164
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #46
Continued from Merge 163

Merge 165
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 166
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #47
Continued from Merge 162

Merge 167
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

Substream
Stream: ['n_Expl', 'there']

Merge 168
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 169
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 170
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #48
Continued from Merge 169

Merge 171
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 172
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):

Backtrack (check for another possible derivation: Free Merge): Attempt: #49
Continued from Merge 118

Merge 173
Merge: set-Merge
Stream: ['seem', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 174
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 175
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['there', 'n_Expl']

Merge 176
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 177
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 178
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 179
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #50
Continued from Merge 178

Merge 180
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 181
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Transfer:
Frontier:

Terminals: C n there T(Pres,3rd,pl) v seem several n fish toT have -en be -en v catch
Externalization
Rules:
there T(Pres,3rd,pl)+seem
there seem several fish to have -en+be
there seem several fish to have been -en+catch
there seem several fish to have been caught

Successful Derivation 3
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