`timescale 1ns/1ns module calculation( input clk, input rst_n, input [3:0] a, input [3:0] b, output [8:0] c ); wire [8:0] c1; wire [8:0] c2; multiplexer multiplexer1 ( .clk(clk), .rst_n(rst_n), .a(a), .b('d12), .c(c1) ); multiplexer multiplexer2 ( .clk(clk), .rst_n(rst_n), .a(b), .b('d5), .c(c2) ); ...