comblogic.v

module comblogic (out, a, b);
   output out;
   input a;
   input b;

   // wires
   wire  t1;

   // instantiation:
   //    primitive   instance-name   (out, in1, in2, ...);
   and lg1(t1,a,b);
   or  lg2(out, t1, b);

endmodule