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,max_cd,min_ab,min_cd;
assign max_ab=(a>b)?a:b;
assign max_cd=(c>d)?c:d;
assign max=(max_ab>max_cd)?max_ab:max_cd;
assign min_ab=(a<b)?a:b;
assign min_cd=(c<d)?c:d;
assign min=(min_ab<min_cd)?min_ab:min_cd;
endmodule