set i = (a,k1) := (b,k2);
A5: InsCode (halt SCMPDS) = 0 by RECDEF_2:def 1;
InsCode ((a,k1) := (b,k2)) = 13 by SCMPDS_2:25;
then (a,k1) := (b,k2) <> halt SCMPDS by A5;
hence (a,k1) := (b,k2) is No-StopCode by COMPOS_0:def 12; :: thesis: verum