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[<0, 2 >]
: nat * nat * (nat * nat)
[<0, 2 >]
: nat * nat * (nat * nat)
(0, 2, (2, 2))
: nat * nat * (nat * nat)
pair (pair O (S (S O))) (pair (S (S O)) O)
: prod (prod nat nat) (prod nat nat)
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