module user_module_341493393195532884(
        input [7:0] io_in,
        output [7:0] io_out
    );
    wire [3:0] a = io_in[7:4];
    wire [3:0] b = io_in[3:0];
    wire [7:0] c;
    assign io_out = c;

    mul #(4) mul_i(a, b, c);

endmodule