Bugs mux4

This 4-to-1 multiplexer doesn't work. Fix the bug(s).

You are provided with a bug-free 2-to-1 multiplexer:

module mux2 (
    input sel,
    input [7:0] a,
    input [7:0] b,
    output [7:0] out
);

Module Declaration

module top_module (
    input [1:0] sel,
    input [7:0] a,
    input [7:0] b,
    input [7:0] c,
    input [7:0] d,
    output [7:0] out  );

//

    wire mux0, mux1;
    mux2 mux0 ( sel[0],    a,    b, mux0 );
    mux2 mux1 ( sel[1],    c,    d, mux1 );
    mux2 mux2 ( sel[1], mux0, mux1,  out );

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Bugs mux4

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