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Example 13 Who did John say will buy the book? (Pesetsky & Torrego 2001:371)
Initial Stream: ['book', 'n_sg_3rd', 'the', 'buy', 'v*', ['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']

Successful Derivation 1
Successful Derivation 2


Merge 1
Merge: set-Merge
Stream: ['the', 'buy', 'v*', ['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['buy', 'v*', ['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: [['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:


Substream
Stream: ['who', 'n_sg_3rd_wh']

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

Main Stream


Merge 6
Merge: set-Merge
Stream: [['who', 'n_sg_3rd_wh'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 8
Merge: set-Merge
Stream: ['C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 9
Merge: set-Merge
Stream: ['say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:
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 8

Merge 10
Merge: set-Merge
Stream: ['C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 11
Merge: set-Merge
Stream: ['say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:



Merge 12
Merge: set-Merge
Stream: ['v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 13
Merge: set-Merge
Stream: [['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:

Substream
Stream: ['John', 'n_sg_3rd']

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

Main Stream


Merge 15
Merge: set-Merge
Stream: [['John', 'n_sg_3rd'], 'Tpast', 'C_Q']
Unlabeled:


Merge 16
Merge: set-Merge
Stream: ['C_Q']
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:

FormCopy:
Access Box: who+C_Q
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 16

Merge 18
Merge: set-Merge
Stream: []
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:

FormCopy:
Access Box: who+C_Q
Transfer:
Frontier:

Spell Out: who+CQ n John T(Past,3rd,sg) v say C T(Pres,3rd,sg) will v* buy the n book
PF Rules: who CQ+T(Past,3rd,sg)
who did John say T(Pres,3rd,sg)+will
who did John say will buy the book

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 7

Merge 20
Merge: set-Merge
Stream: ['Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 21
Merge: set-Merge
Stream: ['C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 22
Merge: set-Merge
Stream: ['say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:
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: #5
Continued from Merge 21

Merge 23
Merge: set-Merge
Stream: ['C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 24
Merge: set-Merge
Stream: ['say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
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 via
movement:



Merge 25
Merge: set-Merge
Stream: ['v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 26
Merge: set-Merge
Stream: [['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:

Substream
Stream: ['John', 'n_sg_3rd']

Merge 27
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 28
Merge: set-Merge
Stream: [['John', 'n_sg_3rd'], 'Tpast', 'C_Q']
Unlabeled:


Merge 29
Merge: set-Merge
Stream: ['C_Q']
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:

FormCopy:
Access Box: who+C_Q
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 29

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


Merge 32
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:
Access Box: who+C_Q
Transfer:
Frontier:

Spell Out: who+CQ n John T(Past,3rd,sg) v say C T(Pres,3rd,sg) will v* buy the n book
PF Rules: who CQ+T(Past,3rd,sg)
who did John say T(Pres,3rd,sg)+will
who did John say will buy the book

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 3

Merge 33
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Unlabeled:


Merge 34
Merge: set-Merge
Stream: [['n_sg_3rd_wh', 'who'], 'will', 'Tpres', 'C', 'say', 'v', ['n_sg_3rd', 'John'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):


# of Merges: 34
# of Backtracks: 6
# of Crashes: 5
# of Successful Derivations: 2

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