68. 4-bit Comparator

How do you plan to solve it?

/*Write your code here*/
module maxmin4(a,b,c,d,max,min);
input [3:0]a,b,c,d;
output [3:0]max,min;
    wire [3:0]max_ab,min_ab;
    wire [3:0]max_cd,min_cd;
    //compare a and b
    assign max_ab=(a>b)?a:b;
    assign min_ab=(a<b)?a:b;
    //comapare c and d
    assign max_cd=(c>d)?c:d;
    assign min_cd=(c<d)?c:d;
    //final max and min
    assign max =(max_ab >max_cd)?max_ab:max_cd;
    assign min=(min_ab <min_cd)?min_ab:min_cd;
endmodule