Move exercises 4.50 and onwards out of amb-natural-language.rkt
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;; Exercise 4.50. Using ramb for generating sentences stops the
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;; generation getting stuck in the out recursion.
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;;; Amb-Eval input:
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(set! parse-word generate-word-ramb)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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ok
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;;; Amb-Eval input:
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(parse '())
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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(simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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4
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(compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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8
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(compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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13
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(compound-sentence (compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun cat))) (verb sleeps)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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18
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(compound-sentence (compound-sentence (compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun cat))) (verb sleeps))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun student))) (verb studies)))
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;;; Amb-Eval input:
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;; Exercise 4.51:
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;;; Amb-Eval input:
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(define count 0)
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(let ((x (an-element-of '(a b c)))
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(y (an-element-of '(a b c))))
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(permanent-set! count (+ count 1))
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(require (not (eq? x y)))
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(list x y count))
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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ok
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;;; Amb-Eval input:
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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(a b 2)
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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3
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(a c 3)
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;; Using set! instead of permanent-set! resets the counter back to 0
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;; on each backtrack of x or y, so will always be 1.
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;; Exercise 4.52
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;;; Amb-Eval input:
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;;; Amb-Eval input:
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(if-fail (let ((x (an-element-of '(1 3 5))))
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(require (even? x))
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x)
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'all-odd)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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all-odd
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;;; Amb-Eval input:
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(if-fail (let ((x (an-element-of '(1 3 5 8))))
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(require (even? x))
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x)
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'all-odd)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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8
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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4
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all-odd
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;;; Amb-Eval input:
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try-again
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;;; There are no more values of
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7
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(if-fail (let ((x (an-element-of (quote (1 3 5 8))))) (require (even? x)) x) (quote all-odd))
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@ -295,146 +295,3 @@ try-again
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;; The generation gets stuck in the outer-most recursion. In this
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;; case, it is the generation of compound sentences from simple sentences.
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;; Exercise 4.50. Using ramb for generating sentences stops the
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;; generation getting stuck in the out recursion.
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;;; Amb-Eval input:
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(set! parse-word generate-word-ramb)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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ok
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;;; Amb-Eval input:
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(parse '())
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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(simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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4
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(compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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8
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(compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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13
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(compound-sentence (compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun cat))) (verb sleeps)))
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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18
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(compound-sentence (compound-sentence (compound-sentence (compound-sentence (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies)) (connective and) (simple-sentence (simple-noun-phrase (article a) ((noun cat))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun professor))) (verb studies))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun cat))) (verb sleeps))) (connective and) (simple-sentence (simple-noun-phrase (article the) ((noun student))) (verb studies)))
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;;; Amb-Eval input:
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;; Exercise 4.51:
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;;; Amb-Eval input:
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(define count 0)
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(let ((x (an-element-of '(a b c)))
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(y (an-element-of '(a b c))))
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(permanent-set! count (+ count 1))
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(require (not (eq? x y)))
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(list x y count))
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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ok
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;;; Amb-Eval input:
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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(a b 2)
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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3
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(a c 3)
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;; Using set! instead of permanent-set! resets the counter back to 0
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;; on each backtrack of x or y, so will always be 1.
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;; Exercise 4.52
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;;; Amb-Eval input:
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;;; Amb-Eval input:
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(if-fail (let ((x (an-element-of '(1 3 5))))
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(require (even? x))
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x)
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'all-odd)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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all-odd
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;;; Amb-Eval input:
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(if-fail (let ((x (an-element-of '(1 3 5 8))))
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(require (even? x))
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x)
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'all-odd)
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;;; Starting a new problem
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;;; Amb-Eval value:
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0
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8
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;;; Amb-Eval input:
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try-again
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;;; Amb-Eval value:
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4
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all-odd
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;;; Amb-Eval input:
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try-again
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;;; There are no more values of
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7
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(if-fail (let ((x (an-element-of (quote (1 3 5 8))))) (require (even? x)) x) (quote all-odd))
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