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Example 13 The book was being read.
Initial Stream: ['book', 'n_3rd_sg', 'the', 'read', 'v', 'Psv', 'Prog', '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', 'read', 'v', 'Psv', 'Prog', 'Tpast', 'C']
Unlabeled:


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



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


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


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


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


Merge 7
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 8
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:

Transfer:
Frontier:

Spell Out: T(Past,3rd,sg) be -ing be -en v read the n book
PF Rules: T(Past,3rd,sg)+be
was -ing+be
was being -en+read
was being read the book

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 7

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


Merge 10
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 6

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


Merge 12
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 13
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 12

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


Merge 15
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 3
Top

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

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


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


Merge 18
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 19
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 18

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


Merge 21
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 4
Top

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

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


Merge 23
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 24
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 23

Merge 25
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 26
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 5
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 4

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


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


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


Merge 30
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 31
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #10
Continued from Merge 30

Merge 32
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 33
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 6
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #11
Continued from Merge 29

Merge 34
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 35
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 36
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #12
Continued from Merge 35

Merge 37
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 38
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 7
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #13
Continued from Merge 28

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


Merge 40
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 41
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 42
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #14
Continued from Merge 41

Merge 43
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 44
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 8
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #15
Continued from Merge 40

Merge 45
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 46
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 47
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 46

Merge 48
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 49
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 9
Top

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

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


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


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


Merge 53
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 54
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 55
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #18
Continued from Merge 54

Merge 56
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 57
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 10
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #19
Continued from Merge 53

Merge 58
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 59
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 60
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #20
Continued from Merge 59

Merge 61
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 62
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 11
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #21
Continued from Merge 52

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


Merge 64
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 65
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 66
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #22
Continued from Merge 65

Merge 67
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 68
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 12
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #23
Continued from Merge 64

Merge 69
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 70
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 71
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 70

Merge 72
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 73
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 13
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #25
Continued from Merge 51

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


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


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


Merge 77
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 78
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #26
Continued from Merge 77

Merge 79
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 80
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 14
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #27
Continued from Merge 76

Merge 81
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 82
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 83
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #28
Continued from Merge 82

Merge 84
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 85
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:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 15
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #29
Continued from Merge 75

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


Merge 87
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 88
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 89
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:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #30
Continued from Merge 88

Merge 90
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 91
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 the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 16
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Backtrack (check for another possible derivation: Free Merge): Attempt: #31
Continued from Merge 87

Merge 92
Merge: set-Merge
Stream: ['Tpast', 'C']
Unlabeled:


Merge 93
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 94
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

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Head:

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FormCopy:
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Head:

Label via
movement:

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Head:

FormCopy:
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Head:

Label via
movement:

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Head:

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movement:

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FormCopy:
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #32
Continued from Merge 93

Merge 95
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 96
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
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Head:

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movement:

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FormCopy:
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Head:

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movement:

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Head:

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FormCopy:
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movement:

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FormCopy:
Transfer:
Frontier:

Spell Out: C the n book T(Past,3rd,sg) be -ing be -en v read
PF Rules: the book T(Past,3rd,sg)+be
the book was -ing+be
the book was being -en+read
the book was being read

Successful Derivation 17
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# of Backtracks: 31
# of Crashes: 15
# of Successful Derivations: 17

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