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

Successful Derivation 1


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


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



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


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


Merge 5
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:

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

Merge 6
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 8
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:

Transfer:
Frontier:

Spell Out: C n there T(Past,1st,sg) v arrive a n train
PF Rules: there T(Past,1st,sg)+arrive
there arrived a train

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 5

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


Merge 12
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 4

Merge 13
Merge: set-Merge
Stream: ['Tpast', ['n_Expl', 'there'], 'C']
Unlabeled:


Merge 14
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:

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

Merge 15
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 17
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:

FormCopy:
Crash (Unlabeled):

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

Merge 18
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Unlabeled:

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

Merge 19
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 20
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'C']
Unlabeled:


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

Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 3

Merge 22
Merge: set-Merge
Stream: ['v', 'Tpast', ['n_Expl', 'there'], 'C']
Unlabeled:


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


Merge 24
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:

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

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

Main Stream


Merge 26
Merge: set-Merge
Stream: [['there', 'n_Expl'], 'C']
Unlabeled:


Merge 27
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:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 24

Merge 28
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Unlabeled:

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

Merge 29
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 31
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 23

Merge 32
Merge: set-Merge
Stream: ['Tpast', ['n_Expl', 'there'], 'C']
Unlabeled:


Merge 33
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:

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

Merge 34
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 36
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:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 33

Merge 37
Merge: set-Merge
Stream: [['n_Expl', 'there'], 'C']
Unlabeled:

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

Merge 38
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


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


Merge 40
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):


# of Merges: 40
# of Backtracks: 7
# of Crashes: 11
# of Successful Derivations: 1

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