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Example 1 Sue is swimming.
Initial Stream: ['swim', 'v', ['n_3rd_sg', 'Sue'], 'Prog', 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2


Merge 1
Merge: set-Merge
Stream: [['n_3rd_sg', 'Sue'], 'Prog', 'Tpres', 'C']
Unlabeled:

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

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

Main Stream


Merge 3
Merge: set-Merge
Stream: [['Sue', 'n_3rd_sg'], 'Prog', 'Tpres', 'C']
Unlabeled:


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


Merge 5
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 6
Merge: set-Merge
Stream: []
Unlabeled:
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 5

Merge 7
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 8
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:

Transfer:
Frontier:

Spell Out: C n Sue T(Pres,3rd,sg) be -ing v swim
PF Rules: Sue T(Pres,3rd,sg)+be
Sue is -ing+swim
Sue is swimming

Successful Derivation 1
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Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 4

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


Merge 10
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 11
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:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 10

Merge 12
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 13
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:

Transfer:
Frontier:

Spell Out: C n Sue T(Pres,3rd,sg) be -ing v swim
PF Rules: Sue T(Pres,3rd,sg)+be
Sue is -ing+swim
Sue is swimming

Successful Derivation 2
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# of Backtracks: 3
# of Crashes: 2
# of Successful Derivations: 2

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