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Example 2 There arrived a train. (Sobin 2014:398)
Initial Stream: ['train', 'n_sg_1st', 'a', 'arrive', 'v', ['n_Expl', 'there'], 'Tpast', 'C']

Successful Derivation 1


Merge 1
Merge: set-Merge
Stream: ['a', 'arrive', 'v', ['n_Expl', 'there'], 'Tpast', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['arrive', 'v', ['n_Expl', 'there'], 'Tpast', 'C']
Label stays
the same:



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


Merge 4
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpast', 'C']
Unlabeled:

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

Merge 5
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 6
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpast', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpast,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 8
Merge: set-Merge
Stream: []
Unlabeled:
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 7

Merge 9
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 10
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:

Transfer:
Frontier:

Terminals: C n there T(Past,1st,sg) v arrive a n train
Externalization
Rules:
there T(Past,1st,sg)+arrive
there arrived a train

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 6

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

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

Merge 12
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 13
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,n)
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:

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

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

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

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

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

Main Stream


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


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


Merge 21
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
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 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 19

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

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

Merge 25
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 26
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,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 via
movement:

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: #8
Continued from Merge 26

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


Merge 29
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:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 3

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


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


Merge 34
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpast,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:

Crash (Unlabeled):

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

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #11
Continued from Merge 33

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

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

Merge 39
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 40
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 41
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:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 40

Merge 42
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 43
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:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 31

Merge 44
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'Tpast', 'C']
FormCopy:
Unlabeled:

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

Merge 45
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 46
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'Tpast', 'C']
Unlabeled:


Merge 47
Merge: set-Merge
Stream: ['C']
Operations: Unified Features: uPerson
Agree: (Tpast,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 48
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #14
Continued from Merge 47

Merge 49
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 50
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 46

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

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

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

Main Stream


Merge 53
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,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 via
movement:

Label from
Head:

Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

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

Backtrack (check for another possible derivation: Free Merge): Attempt: #16
Continued from Merge 53

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


Merge 56

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:

Operations: Unchecked Features: uPerson
Crash (Unchecked Feature):
# of Backtracks: 15
# of Crashes: 15
# of Successful Derivations: 1

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