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Exercise 2.40: Define a procedure
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unique-pairs that, given an integer
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n
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, generates the sequence of
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pairs
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(
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i
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,
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j
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)
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with
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1
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≤
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j
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<
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i
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≤
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n
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. Use unique-pairs
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to simplify the definition of prime-sum-pairs given above.
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