fact: Definition sizeof_pair (lss : list A * list B) : nat := length (fst lss) + length (snd lss).
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.Arith.EqNat Coq.Arith.Compare_dec Coq.ZArith.ZArith Coq.Lists.List Fiat.Common.List.ListFacts Fiat.Common