68. 4-bit Comparator

How do you plan to solve it?

module maxmin4(
    input  [3:0] a, b, c, d,
    output reg [3:0] min, max
);
reg [3:0] max_ab,max_cd,min_ab,min_cd;
always @(*) begin
    
    max_ab= (a>=b) ?a:b;
    max_cd=(c>=d)?c:d;
    min_cd=(c<d)?c:d;
    min_ab=(a<b)?a:b;
    max=(max_ab>=max_cd)?max_ab:max_cd;
    min=(min_ab<min_cd)?min_ab:min_cd;
end
endmodule