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 = a>b ? a:b;
wire [3:0] min_ab = a>b?b:a;
wire [3:0] max_cd= c>d ? c:d;
wire [3:0] min_cd = c>d ? d:c;
assign max=max_ab>=max_cd ? max_ab :max_cd;
assign min=min_ab<min_cd ? min_ab : min_cd;
endmodule