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Example 7 There is likely to arrive a man./There is likely a man to arrive. (Chomsky 2001:16)
Initial Stream: ['man', 'n_sg_3rd', 'a', 'arrive', 'v', 'toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2


Merge 1
Merge: set-Merge
Stream: ['a', 'arrive', 'v', 'toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['arrive', 'v', 'toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v', 'toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: ['toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 5
Merge: set-Merge
Stream: ['likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


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


Merge 7
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


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

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

Merge 9
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 10
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 11
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 12
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 11

Merge 13
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 14
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 from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

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

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


Merge 16
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:

Transfer:
Frontier:

Terminals: C n there T(Pres,3rd,sg) v adj likely toT v arrive a n man
Externalization
Rules:
there T(Pres,3rd,sg)+v
there is likely to arrive a man

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 10

Merge 17
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
FormCopy:
Unlabeled:

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

Merge 18
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 19
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 20
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:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 19

Merge 21
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 22
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 from
Head:

Label from
Head:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 8

Merge 23
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:

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

Merge 24
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 25
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 26
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 27
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 26

Merge 28
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 29
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 from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 7

Merge 30
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 31
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

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

Merge 32
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 33
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 34
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 35
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 34

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


Merge 37
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #10
Continued from Merge 6

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


Merge 39
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 40
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

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

Merge 41
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 42
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


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


Merge 44
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:

Crash (Unlabeled):

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

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 5

Merge 47
Merge: set-Merge
Stream: ['likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 48
Merge: set-Merge
Stream: ['adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


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


Merge 50
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

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

Merge 51
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 52
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 53
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 54
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 53

Merge 55
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 56
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 via
shared Person:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Transfer:
Frontier:

Terminals: C n there T(Pres,3rd,sg) v adj likely a n man toT v arrive
Externalization
Rules:
there T(Pres,3rd,sg)+v
there is likely a man to arrive

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #14
Continued from Merge 4

Merge 57
Merge: set-Merge
Stream: ['toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 58
Merge: set-Merge
Stream: ['likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


Merge 59
Merge: set-Merge
Stream: ['adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 60
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 61
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

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

Merge 62
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 64
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 65
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 64

Merge 66
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 67
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #16
Continued from Merge 3

Merge 68
Merge: set-Merge
Stream: ['v', 'toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
FormCopy:
Unlabeled:


Merge 69
Merge: set-Merge
Stream: ['toT', 'likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 70
Merge: set-Merge
Stream: ['likely', 'adj', 'v', ['n_Expl', 'there'], 'Tpres', 'C']
Operations: Agree: (toT,n)
Checked Features: 'uPerson'
Unlabeled:


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


Merge 72
Merge: set-Merge
Stream: ['v', ['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:


Merge 73
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpres', 'C']
Unlabeled:

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

Merge 74
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 75
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpres', 'C']
Unlabeled:


Merge 76
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpres,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 77
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #17
Continued from Merge 76

Merge 78
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 79
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:

Crash (Unlabeled):

# of Backtracks: 16
# of Crashes: 15
# of Successful Derivations: 2

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