fact: Variable Σ : list (ndmm2_instr nat).
imports: List Permutation Arith Lia Undecidability.MinskyMachines(ndMM2) Undecidability.ILL(IMSELL imsell) Undecidability.Shared.Libs.DLW(utils pos vec) Undecidability.Synthetic(Definitions ReducibilityFacts)