68. 4-bit Comparator

How do you plan to solve it?

module maxmin4(
    input [3:0]a,b,c,d,
    output [3:0]max,min
);

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