set i = (a,k1) := k2;
A4: InsCode (halt SCMPDS) = 0 by SCMPDS_2:21, SCMPDS_2:93;
InsCode ((a,k1) := k2) = 7 by SCMPDS_2:28;
hence (a,k1) := k2 is No-StopCode by A4, Def1; :: thesis: verum