68. 4-bit Comparator

How do you plan to solve it?

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