fact: Definition M' := repeat mm2_inc_a a0 ++ repeat mm2_inc_b b0 ++ map shift_instr M.
imports: List PeanoNat Lia Relations.Relation_Operators Relations.Operators_Properties Undecidability.MinskyMachines.MM2 Undecidability.MinskyMachines.Util.MM2_facts ssreflect ssrbool ssrfun