fact: Variables (s a h l : pos n) (Hsa : s <> a) (Hsh : s <> h) (Hsl : s <> l) (Hah : a <> h) (Hal : a <> l) (Hhl : h <> l) (lt : list ((list bool)*list bool)).
imports: List Arith Lia Bool Undecidability.Shared.Libs.DLW(utils list_bool pos vec subcode sss) Undecidability.StackMachines.BSM(tiles_solvable bsm_defs)