for s being State of SCM+FSA
for a being read-write Int-Location
for bb, cc being Int-Location
for I being MacroInstruction of SCM+FSA
for p being Instruction-Sequence of SCM+FSA st s . (intloc 0) = 1 holds
for aux being read-write Int-Location st aux = 1 -stRWNotIn ({a,bb,cc} \/ (UsedILoc I)) holds
DataPart (IExec (((((aux := cc) ";" (SubFrom (aux,bb))) ";" (AddTo (aux,(intloc 0)))) ";" (a := bb)),p,s)) = DataPart ((s +* (aux,(((s . cc) - (s . bb)) + 1))) +* (a,(s . bb)))