module mycir(a, b, f);
input   a, b;
output f;
wire    m, n, p, q;

assign m = ~a;
assign n = ~b;

assign p = ~ (m & n);
assign q = a & b;

assign f = p | q;

endmodule






`timescale 1ns / 1ns
module mycir_tb;

reg  a, b;
wire  f;


mycir  g1 ( .a(a), .b(b), .f(f) );



//mycir g1( a, b, f);

initial begin
         a = 0;  b= 0;
  #10 a =0; b = 1;
  #10 a =1; b = 0;
  #10 a =1; b = 1;
  #10 $stop;
end

initial $monitor($time, "ns, a=%b, b=%b, f=%b", a, b, f);

endmodule