fact: Definition stack_eqb := list_eqb (prod_eqb (list_eqb Bool.eqb) (list_eqb Bool.eqb)).
imports: Undecidability.Synthetic(Definitions EnumerabilityFacts ListEnumerabilityFacts) Lia Undecidability.L(LProd LBool LNat LOptions) Undecidability.L.Datatypes.List(List_basics List_eqb List_extra List_nat)