68. 4-bit Comparator

How do you plan to solve it?

module maxmin4 (max, min, a, b, c, d);
input [3:0] a, b, c, d;
output reg [3:0] max, min;
reg [3:0] max1, max2, min1, min2;

always @(*)
begin
    max1 = (a>b) ? a:b;
    max2 = (c>d) ? c:d;
    max = (max1>max2) ? max1: max2;
    min1 = (a<b) ? a:b;
    min2 = (c<d) ? c:d;
    min = (min1<min2) ? min1: min2;
end
endmodule