68. 4-bit Comparator

How do you plan to solve it?

module maxmin4 (
    input  [3:0] a, b, c, d,
    output [3:0] max,
    output [3:0] 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