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)  ? a : b;

wire [3:0] max_cd = (c >= d)  ? c : d;
wire [3:0] 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