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+definition module ABC.Machine.Program
+
+from ABC.Machine.Def import ::InstrId, ::Instruction, ::State
+
+pc_init :: InstrId
+pc_next :: InstrId -> InstrId
+pc_halt :: InstrId -> InstrId
+pc_end :: InstrId -> Bool
+
+:: ProgramStore
+
+ps_get :: InstrId ProgramStore -> Instruction
+ps_init :: [Instruction] -> ProgramStore