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Example 2 Sue prefers John to be swimming.
Initial Stream: ['swim', 'v', ['n_3rd_sg', 'John'], 'Prog', 'toT', 'prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2


Merge 1
Merge: set-Merge
Stream: [['n_3rd_sg', 'John'], 'Prog', 'toT', 'prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:

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

Merge 2
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 3
Merge: set-Merge
Stream: [['John', 'n_3rd_sg'], 'Prog', 'toT', 'prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: ['toT', 'prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 5
Merge: set-Merge
Stream: ['prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson'
Unlabeled:


Merge 6
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
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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: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 9
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
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Label from
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Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 5

Merge 10
Merge: set-Merge
Stream: ['prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 11
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 12
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
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FormCopy:
Label from
Head:

Label via
movement:


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

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

Main Stream


Merge 14
Merge: set-Merge
Stream: [['Sue', 'n_3rd_sg'], 'Tpres', '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:

Crash (Unlabeled):

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

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n Sue T(Pres,3rd,sg) v* prefer n John toT be -ing v swim
PF Rules: Sue T(Pres,3rd,sg)+prefer
Sue prefers John to be -ing+swim
Sue prefers John to be swimming

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 11

Merge 19
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 20
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 4

Merge 21
Merge: set-Merge
Stream: ['toT', 'prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 22
Merge: set-Merge
Stream: ['prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson'
Unlabeled:


Merge 23
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 24
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 23

Merge 25
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 26
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
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Label from
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FormCopy:
Label from
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Label via
movement:

Label from
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FormCopy:
Label from
Head:

Label via
movement:

Crash (Unlabeled):

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

Merge 27
Merge: set-Merge
Stream: ['prefer', 'v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 28
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 29
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

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Label via
shared features:

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Head:

Label from
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FormCopy:
Label from
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movement:

Label from
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FormCopy:
Label from
Head:

Label via
movement:


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

Merge 30
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 31
Merge: set-Merge
Stream: [['Sue', 'n_3rd_sg'], 'Tpres', 'C']
Unlabeled:


Merge 32
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 33
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 32

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


Merge 35
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n Sue T(Pres,3rd,sg) v* prefer n John toT be -ing v swim
PF Rules: Sue T(Pres,3rd,sg)+prefer
Sue prefers John to be -ing+swim
Sue prefers John to be swimming

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #10
Continued from Merge 28

Merge 36
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Unlabeled:


Merge 37
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
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FormCopy:
Label from
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Label via
movement:

Label from
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FormCopy:
Label from
Head:

Label via
movement:

Crash (Unlabeled):

# of Backtracks: 9
# of Crashes: 8
# of Successful Derivations: 2

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