`timescale 1ns/1ns module mux4_1( input [1:0]d1,d2,d3,d0, input [1:0]sel, output[1:0]mux_out ); //*************code***********// //assign mux_out = sel[0] ? ( sel[1] ? d0 : d2) : (sel[1] ? d1 : d3); wire [7:0]d; assign d={d3,d2,d1,d0}; assign mux_out={d[7-2*sel],d[6-2*sel]}; //*************cod...