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Can someone please explain how the 'pair of a pair' works, and also what the '2' at the front of the expression means? Question 9

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Can someone please explain how the 'pair of a pair' works, and also what the '2' at the front of the expression means?

Question 9 What does the expression 2 fst (pair (pair 35 7) (pair 23 18)) evaluate to? pair 357 23 18 ect! 35 pair 23 18 7

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