68. 4-bit Comparator

How do you plan to solve it?

/*Write your code here*/
module maxmin4(
    input [3:0] a, b, c, d,
    output [3:0] max, min 
);
    wire [3:0] max_ab = ( a >= b ) ? a : b;
    wire [3:0] min_ab = ( a < b ) ? a : b;

    wire [3:0] max_cd = ( c >= d ) ? c : d;
    wire [3:0] min_cd = ( c < d ) ? c : d;

    assign max = ( max_ab >= max_cd ) ? max_ab : max_cd;
    assign min = ( min_ab < min_cd ) ? min_ab : min_cd;
endmodule