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Example 1 A train arrived.
Initial Stream: ['train', 'n_3rd_sg', 'a', 'arrive', 'v', 'Tpast', 'C']

Successful Derivation 1


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: Agree: (Tpast,n)
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:

Label from
Head:

Crash (No Case):

   ➔

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

Merge 7
Merge: set-Merge
Stream: ['C']
FormCopy:
Unlabeled:


Merge 8
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:

Transfer:
Frontier:

Terminals: C a n train T(Past,3rd,sg) v arrive
Externalization
Rules:
a train T(Past,3rd,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']
FormCopy:
Unlabeled:


Merge 10
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,n)
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:

Label from
Head:

Crash (Unlabeled):

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

Merge 12
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
FormCopy:
Unlabeled:


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


Merge 14
Merge: set-Merge
Stream: ['C']
Operations: Agree: (Tpast,n)
Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 15
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):

# of Backtracks: 3
# of Crashes: 3
# of Successful Derivations: 1

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