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Exercise 2.39: Complete the following
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definitions of reverse (Exercise 2.18) in terms of
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fold-right and fold-left from Exercise 2.38:
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(define (reverse sequence)
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(fold-right
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(lambda (x y) ⟨??⟩) nil sequence))
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(define (reverse sequence)
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(fold-left
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(lambda (x y) ⟨??⟩) nil sequence))
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