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 reg [3:0] max,
output reg [3:0] min
);
reg [3:0] max_ab, min_ab, max_cd, min_cd;
always @* begin
    max_ab = (a>=b)? a:b;
    min_ab = (a<b)? a:b;
    max_cd = (c>=d)? c:d;
    min_cd = (c<d)? c:d;

max = (max_ab>=max_cd)? max_ab:max_cd;
min = (min_ab<min_cd)? min_ab:min_cd;
end
endmodule