68. 4-bit Comparator

How do you plan to solve it?

/*Write your code here*/
module maxmin4(
    input [3:0]a,
    input [3:0]b,
    input [3:0]c,
    input [3:0]d,
    output  [3:0]max,
    output  [3:0]min
);

 wire [3:0] max_ab=(a>=b)?a:b;
 wire [3:0] max_cd=(c>=d)?c:d;
 wire [3:0] min_ab=(a<b)?a:b;
 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