module top (a,b);

output b;       // click in b

input  a;       // the end!

/*
 * 
 *
 */

wire c = a ; // click on a



wire d = ( c ^ 1'b1 ); // click on c


always @(posedge clk)
    begin
    b <= d; // click on d
    end

























assign d = c; // click on c



























































endmodule