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
);
    function [3:0] max2;
        input [3:0] x,y;
        begin
            max2 = (x>y) ? x : y;
        end
    endfunction

    function [3:0] min2;
        input [3:0] x,y;
        begin
            min2 = (x>y) ? y : x;
        end
    endfunction

    wire [3:0] min_ab, min_cd, max_ab, max_cd;;

    assign min_ab = min2(a,b);
    assign min_cd = min2(c,d);
    assign max_ab = max2(a,b);
    assign max_cd = max2(c,d);

    assign max = max2(max_ab, max_cd);
    assign min = min2(min_ab, min_cd);
    
endmodule