public static new SCode Make(Primitive2 rator, Argument0 rand0, SCode rand1)
 {
     return
         ((rand1 is StaticVariable) ? PrimitiveLessThanFixnumA0S.Make(rator, rand0, (StaticVariable)rand1) :
          (rand1 is Quotation) ? PrimitiveLessThanFixnumA0Q.Make(rator, rand0, (Quotation)rand1) :
          new PrimitiveLessThanFixnumA0(rator, rand0, rand1));
 }