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Example 1 A train arrived.
Initial Stream: ['train', 'n_sg_1st', 'a', 'arrive', 'v', 'Tpast', 'C']

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


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


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



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


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


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


Merge 6
Merge: set-Merge
Stream: []
Unlabeled:
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 5

Merge 7
Merge: set-Merge
Stream: ['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:

FormCopy:
Transfer:
Frontier:

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

Successful Derivation 1
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Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 4

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


Merge 10
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 11
Merge: set-Merge
Stream: []
Unlabeled:
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 10

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


Merge 13
Merge: set-Merge
Stream: []
Unlabeled:
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:
Transfer:
Frontier:

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

Successful Derivation 2
Top

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

Merge 14
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


Merge 15
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 16
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 17
Merge: set-Merge
Stream: []
Unlabeled:
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 16

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


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

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

Successful Derivation 3
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 15

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


Merge 21
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 22
Merge: set-Merge
Stream: []
Unlabeled:
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 21

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


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

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

Successful Derivation 4
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# of Merges: 24
# of Backtracks: 7
# of Crashes: 4
# of Successful Derivations: 4

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