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Example 4 Mary arrived.
Initial Stream: ['Mary', 'n_3rd_sg', 'arrive', 'v', 'Tpast', 'C']

Successful Derivation 1
Successful Derivation 2
Successful Derivation 3
Successful Derivation 4
Successful Derivation 5


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


Merge 2
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


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


Merge 4
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 5
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Transfer:
Frontier:

Spell Out: T(Past,3rd,sg) v arrive n Mary
PF Rules: T(Past,3rd,sg)+arrive
arrived Mary

Successful Derivation 1
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Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 4

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


Merge 7
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 n Mary T(Past,3rd,sg) v arrive
PF Rules: Mary T(Past,3rd,sg)+arrive
Mary arrived

Successful Derivation 2
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Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 3

Merge 8
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 9
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 10
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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 9

Merge 11
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 12
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 n Mary T(Past,3rd,sg) v arrive
PF Rules: Mary T(Past,3rd,sg)+arrive
Mary arrived

Successful Derivation 3
Top

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

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


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


Merge 15
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 16
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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 15

Merge 17
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 18
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 n Mary T(Past,3rd,sg) v arrive
PF Rules: Mary T(Past,3rd,sg)+arrive
Mary arrived

Successful Derivation 4
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 14

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


Merge 20
Merge: set-Merge
Stream: ['C']
Operations: 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:

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 20

Merge 22
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 23
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 n Mary T(Past,3rd,sg) v arrive
PF Rules: Mary T(Past,3rd,sg)+arrive
Mary arrived

Successful Derivation 5
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# of Backtracks: 7
# of Crashes: 3
# of Successful Derivations: 5

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