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Example 5 Susan was late for dinner.
Initial Stream: ['Susan', 'n_3rd_sg', 'late', 'adj', 'be', 'v', 'Tpast', 'C']

Successful Derivation 1
Successful Derivation 2
Successful Derivation 3
Successful Derivation 4
Successful Derivation 5
Successful Derivation 6
Successful Derivation 7
Successful Derivation 8


Merge 1
Merge: set-Merge
Stream: ['late', 'adj', 'be', 'v', 'Tpast', 'C']
Unlabeled:


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


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


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


Merge 5
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 6
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 7
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 6

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


Merge 9
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: #3
Continued from Merge 5

Merge 10
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 11
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 12
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:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 11

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


Merge 14
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:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 4

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


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


Merge 17
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 18
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:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 17

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


Merge 20
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:

Label from
Head:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 16

Merge 21
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 22
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 23
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:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 22

Merge 24
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 25
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:

Label from
Head:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 2
Top

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

Merge 26
Merge: set-Merge
Stream: ['be', 'v', 'Tpast', 'C']
Unlabeled:


Merge 27
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


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


Merge 29
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 30
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:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #10
Continued from Merge 29

Merge 31
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 32
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:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #11
Continued from Merge 28

Merge 33
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 34
Merge: set-Merge
Stream: ['C']
Operations: 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:

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: #12
Continued from Merge 34

Merge 36
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 37
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:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 27

Merge 38
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


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


Merge 40
Merge: set-Merge
Stream: ['C']
Operations: 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:

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: #14
Continued from Merge 40

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


Merge 43
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:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 3
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 39

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


Merge 45
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 46
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:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #16
Continued from Merge 45

Merge 47
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 48
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:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 4
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #17
Continued from Merge 2

Merge 49
Merge: set-Merge
Stream: ['adj', 'be', 'v', 'Tpast', 'C']
Unlabeled:


Merge 50
Merge: set-Merge
Stream: ['be', 'v', 'Tpast', 'C']
Unlabeled:


Merge 51
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


Merge 52
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 53
Merge: set-Merge
Stream: ['C']
Operations: 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 from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #18
Continued from Merge 53

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


Merge 56
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: #19
Continued from Merge 52

Merge 57
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 58
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 59
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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: #20
Continued from Merge 58

Merge 60
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 61
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #21
Continued from Merge 51

Merge 62
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


Merge 63
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 64
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 65
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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: #22
Continued from Merge 64

Merge 66
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 67
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:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 5
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #23
Continued from Merge 63

Merge 68
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 69
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 70
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:

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: #24
Continued from Merge 69

Merge 71
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 72
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:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Transfer:
Frontier:

Spell Out: C n Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 6
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #25
Continued from Merge 50

Merge 73
Merge: set-Merge
Stream: ['be', 'v', 'Tpast', 'C']
Unlabeled:


Merge 74
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


Merge 75
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 76
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 77
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

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: #26
Continued from Merge 76

Merge 78
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 79
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #27
Continued from Merge 75

Merge 80
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 81
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 82
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #28
Continued from Merge 81

Merge 83
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 84
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #29
Continued from Merge 74

Merge 85
Merge: set-Merge
Stream: ['v', 'Tpast', 'C']
Unlabeled:


Merge 86
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 87
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 88
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #30
Continued from Merge 87

Merge 89
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 90
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:
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 Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 7
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #31
Continued from Merge 86

Merge 91
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 92
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 93
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:
Label from
Head:

Label via
movement:

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: #32
Continued from Merge 92

Merge 94
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 95
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:
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 Susan T(Past,3rd,sg) v be adj late
PF Rules: Susan T(Past,3rd,sg)+v
Susan was late

Successful Derivation 8
Top

# of Backtracks: 31
# of Crashes: 24
# of Successful Derivations: 8

Top