theorem
 rng Macro i = {i, halt S}
 proof
  thus rng Macro i = rng Load i \/ rng Stop S by AFINSQ_1:26
    .= {i} \/ rng Stop S by AFINSQ_1:33
    .= {i} \/ {halt S} by AFINSQ_1:33
    .= {i, halt S} by ENUMSET1:1;
 end;
