/**
 * 16-bit multiplexor:
 * for i = 0..15 out[i] = a[i] if sel == 0
 *                        b[i] if sel == 1
 */

`default_nettype none
module Mux4Way16(
    input [15:0] a,
    input [15:0] b,
    input [15:0] c,
    input [15:0] d,
       input [1:0] sel,
    output [15:0] out
);

    // Put your code here:
    wire  [15:0] outab;
    wire  [15:0] outcd;

    Mux16 MUX16A(a[15:0], b[15:0], sel[0], outab[15:0]);
    Mux16 MUX16B(c[15:0], d[15:0], sel[0], outcd[15:0]);
    Mux16 MUX16(outab[15:0], outcd[15:0], sel[1], out[15:0]);
endmodule