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Example 15 There were believed to have been caught several fish./There were believed to have been several fish caught./There were believed several fish to have been caught./There were several fish believed to have been caught. (Chomsky 2001:19)
Initial Stream: ['fish', 'n_pl_3rd', 'several', 'catch', 'v', 'Psv', 'Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']

Successful Derivation 1
Successful Derivation 2
Successful Derivation 3
Successful Derivation 4


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


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



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


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


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


Merge 6
Merge: set-Merge
Stream: ['toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


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


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


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


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


Merge 13
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 14
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
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Label from
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Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 13

Merge 15
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 16
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label via
shared features:

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
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: #3
Continued from Merge 13

Merge 17
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 18
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 via
movement:

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
Head:

Transfer:
Frontier:

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

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 12

Merge 19
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 20
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


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

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
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Label from
Head:

Label from
Head:

Label from
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Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 20

Merge 22
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 23
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

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 from
Head:

Label from
Head:

Label from
Head:

Transfer:
Frontier:

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

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 12

Merge 24
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


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


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

Label from
Head:

Label from
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Label from
Head:

Label from
Head:

Crash (No Case):

   ➔

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 25

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


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

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

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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:

Crash (No Case):

   ➔

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 11

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

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

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

Main Stream


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


Merge 32
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 33
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
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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 32

Merge 34
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 35
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 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: #10
Continued from Merge 31

Merge 36
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 37
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 38
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

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
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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 9

Merge 39
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:

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

Merge 40
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 41
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 42
Merge: set-Merge
Stream: ['Tpast', 'C']
Operations: Unified Features: uPerson
Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 43
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 44
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 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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 43

Merge 45
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


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

Label from
Head:

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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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: #13
Continued from Merge 42

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


Merge 48
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 49
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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 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: #14
Continued from Merge 8

Merge 50
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


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

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

Merge 52
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 53
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 54
Merge: set-Merge
Stream: ['Tpast', 'C']
Operations: Unified Features: uPerson
Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 55
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 56
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
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Label from
Head:

Label from
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Label from
Head:

Label from
Head:

Label from
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Label from
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Label from
Head:

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: #15
Continued from Merge 55

Merge 57
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 58
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 via
movement:

Label from
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Label from
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Label from
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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: #16
Continued from Merge 54

Merge 59
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 60
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 61
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared Person:

Label from
Head:

Label from
Head:

Label from
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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: #17
Continued from Merge 7

Merge 62
Merge: set-Merge
Stream: ['believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


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


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


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


Merge 68
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 69
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
shared Person:

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: #18
Continued from Merge 68

Merge 70
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 71
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 via
movement:

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:

Transfer:
Frontier:

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

Successful Derivation 3
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #19
Continued from Merge 67

Merge 72
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


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


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

Crash (No Case):

   ➔

Backtrack (check for another possible derivation: Free Merge): Attempt: #20
Continued from Merge 6

Merge 75
Merge: set-Merge
Stream: ['toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


Merge 76
Merge: set-Merge
Stream: ['believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


Merge 77
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 78
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:

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

Merge 79
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 80
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 81
Merge: set-Merge
Stream: ['Tpast', 'C']
Operations: Unified Features: uPerson
Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 82
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 83
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
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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
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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: #21
Continued from Merge 82

Merge 84
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 85
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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Label from
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movement:

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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: #22
Continued from Merge 81

Merge 86
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 87
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 88
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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 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
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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: #23
Continued from Merge 5

Merge 89
Merge: set-Merge
Stream: ['Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


Merge 90
Merge: set-Merge
Stream: ['toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 91
Merge: set-Merge
Stream: ['believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


Merge 92
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


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

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

Merge 94
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 95
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 96
Merge: set-Merge
Stream: ['Tpast', 'C']
Operations: Unified Features: uPerson
Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 97
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 98
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
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Label via
shared features:

Label from
Head:

Label from
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Label from
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Label from
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Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #24
Continued from Merge 97

Merge 99
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 100
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared Person:

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shared features:

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Transfer:
Frontier:

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

Successful Derivation 4
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Backtrack (check for another possible derivation: Free Merge): Attempt: #25
Continued from Merge 96

Merge 101
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 102
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


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

Label from
Head:

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Head:

Label via
shared Person:

Label from
Head:

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Head:

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movement:

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Crash (No Case):

   ➔

Backtrack (check for another possible derivation: Free Merge): Attempt: #26
Continued from Merge 4

Merge 104
Merge: set-Merge
Stream: ['Psv', 'Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


Merge 105
Merge: set-Merge
Stream: ['Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 106
Merge: set-Merge
Stream: ['toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 107
Merge: set-Merge
Stream: ['believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (toT,Psv)
Checked Features: 'uPerson'
Unlabeled:


Merge 108
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 109
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:

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

Merge 110
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 111
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 112
Merge: set-Merge
Stream: ['Tpast', 'C']
Operations: Unified Features: uPerson
Agree: (Psv,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


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


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

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Head:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #27
Continued from Merge 113

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


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

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Head:

Label via
shared Person:

Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #28
Continued from Merge 112

Merge 117
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 118
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 119
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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shared Person:

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movement:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #29
Continued from Merge 3

Merge 120
Merge: set-Merge
Stream: ['v', 'Psv', 'Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
FormCopy:
Unlabeled:


Merge 121
Merge: set-Merge
Stream: ['Psv', 'Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 122
Merge: set-Merge
Stream: ['Perf', 'toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (Psv,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 123
Merge: set-Merge
Stream: ['toT', 'believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 124
Merge: set-Merge
Stream: ['believe', 'v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Operations: Agree: (toT,Psv)
Checked Features: 'uPerson'
Unlabeled:


Merge 125
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 126
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Psv', 'Tpast', 'C']
Unlabeled:

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

Merge 127
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 128
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Psv', 'Tpast', 'C']
Unlabeled:


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


Merge 130
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 131
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #30
Continued from Merge 130

Merge 132
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 133
Merge: set-Merge
Stream: []
Unlabeled:
Label from
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shared Person:

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movement:

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Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #31
Continued from Merge 129

Merge 134
Merge: set-Merge
Stream: ['Tpast', 'C']
FormCopy:
Unlabeled:


Merge 135
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,Psv)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 136
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
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Label from
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Label via
shared Person:

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movement:

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Crash (Unlabeled):


# of Merges: 136
# of Backtracks: 30
# of Crashes: 27
# of Successful Derivations: 4

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