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Example 8 He was seen leaving the building.
Initial Stream: ['building', 'n_3rd_sg', 'the', 'leave', 'v*', ['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', '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
Successful Derivation 9
Successful Derivation 10
Successful Derivation 11
Successful Derivation 12
Successful Derivation 13
Successful Derivation 14
Successful Derivation 15
Successful Derivation 16
Successful Derivation 17


Merge 1
Merge: set-Merge
Stream: ['the', 'leave', 'v*', ['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['leave', 'v*', ['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: [['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:


Substream
Stream: ['he', 'n_3rd_sg']

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

Main Stream


Merge 6
Merge: set-Merge
Stream: [['he', 'n_3rd_sg'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['see', 'v', 'Psv', 'Tpast', 'C']
Operations: Checked Features: 'uPerson'
Unlabeled:


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


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


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:

Crash (Unlabeled):

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

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 10

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:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

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

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 9

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


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:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

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

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 3
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 21

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


Merge 27
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 28
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:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 27

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


Merge 30
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:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 4
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 8

Merge 31
Merge: set-Merge
Stream: ['v', 'Psv', 'Tpast', 'C']
Unlabeled:


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


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:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

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

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 5
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #11
Continued from Merge 33

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


Merge 39
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 40
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:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 39

Merge 41
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 42
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:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 6
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 32

Merge 43
Merge: set-Merge
Stream: ['Psv', 'Tpast', 'C']
Unlabeled:


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:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

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

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 via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 7
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 44

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


Merge 50
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 51
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:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #16
Continued from Merge 50

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


Merge 53
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:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 8
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #17
Continued from Merge 7

Merge 54
Merge: set-Merge
Stream: ['see', 'v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 55
Merge: set-Merge
Stream: ['v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 56
Merge: set-Merge
Stream: ['Psv', 'Tpast', 'C']
Unlabeled:


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:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: T(Past,3rd,sg) be -en v see n he -ing v* leave the n building
PF Rules: T(Past,3rd,sg)+be
was -en+see
was seen he Ting+leave
was seen he leaving the building

Successful Derivation 9
Top

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

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 10
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #19
Continued from Merge 57

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


Merge 63
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 64
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #20
Continued from Merge 63

Merge 65
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 66
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 11
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #21
Continued from Merge 56

Merge 67
Merge: set-Merge
Stream: ['Psv', 'Tpast', 'C']
Unlabeled:


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:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

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

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:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 12
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #23
Continued from Merge 68

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


Merge 74
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 75
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:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #24
Continued from Merge 74

Merge 76
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 77
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:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 13
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #25
Continued from Merge 55

Merge 78
Merge: set-Merge
Stream: ['v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 79
Merge: set-Merge
Stream: ['Psv', 'Tpast', 'C']
Unlabeled:


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:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #26
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:

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 via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 14
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #27
Continued from Merge 80

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


Merge 86
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 87
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #28
Continued from Merge 86

Merge 88
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 89
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:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 15
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Backtrack (check for another possible derivation: Free Merge): Attempt: #29
Continued from Merge 79

Merge 90
Merge: set-Merge
Stream: ['Psv', 'Tpast', 'C']
Unlabeled:


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:

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 via
movement:

Crash (Unlabeled):

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

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 via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 16
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Backtrack (check for another possible derivation: Free Merge): Attempt: #31
Continued from Merge 91

Merge 96
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 97
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 98
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:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #32
Continued from Merge 97

Merge 99
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 100
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:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n he T(Past,3rd,sg) be -en v see -ing v* leave the n building
PF Rules: he T(Past,3rd,sg)+be
he was -en+see
he was seen Ting+leave
he was seen leaving the building

Successful Derivation 17
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Backtrack (check for another possible derivation: Free Merge): Attempt: #33
Continued from Merge 3

Merge 101
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Unlabeled:


Merge 102
Merge: set-Merge
Stream: [['n_3rd_sg', 'he'], 'T_ing', 'see', 'v', 'Psv', 'Tpast', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):


# of Merges: 102
# of Backtracks: 32
# of Crashes: 16
# of Successful Derivations: 17

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