for I being set holds
( I is Instruction of SCM iff ( I = [0,{},{}] or ex a, b being Data-Location st I = a := b or ex a, b being Data-Location st I = AddTo (a,b) or ex a, b being Data-Location st I = SubFrom (a,b) or ex a, b being Data-Location st I = MultBy (a,b) or ex a, b being Data-Location st I = Divide (a,b) or ex loc being Nat st I = SCM-goto loc or ex a being Data-Location ex loc being Nat st I = a =0_goto loc or ex a being Data-Location ex loc being Nat st I = a >0_goto loc ) ) by Lm12;