68. 4-bit Comparator

How do you plan to solve it?

module maxmin4(
    input [3:0] a,b,c,d,
    output reg [3:0] max, min
);
    reg [3:0] max_m1, min_m1, max_m2, min_m2;
    always @(*) begin
        if (a < b) begin
        max_m1 = b;
        min_m1 = a;
        end
        else begin
        max_m1 = a;
        min_m1 = b;
        end


        if (c < d) begin
        max_m2 = d;
        min_m2 = c;
        end
        else begin
        max_m2 = c;
        min_m2 = d;
        end

        if (max_m1 < max_m2) begin
        max = max_m2;
        end
        else begin
        max = max_m1;
        end

        if (min_m1 < min_m2) begin
        min = min_m1;
        end
        else begin
        min = min_m2;
        end
        

    end

endmodule