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Exercise 4.53: With permanent-set! as
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described in Exercise 4.51 and if-fail as in Exercise 4.52,
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what will be the result of evaluating
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(let ((pairs '()))
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(if-fail
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(let ((p (prime-sum-pair
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'(1 3 5 8)
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'(20 35 110))))
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(permanent-set! pairs
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(cons p pairs))
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(amb))
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pairs))
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