fact: Variable (x y z : pos n) (Hxy : x <> y) (Hxz : x <> z) (Hyz : y <> z) (i : nat).
imports: List Arith Lia Bool Undecidability.Shared.Libs.DLW(utils list_bool pos vec subcode sss) Undecidability.StackMachines.BSM(tiles_solvable bsm_defs)