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,
    output [3:0]min
);
    wire [3:0] max_ab,max_cd;
    wire [3:0] 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