11. Vector Concatenation

How do you plan to solve it?

module concat8_packer(
    input [3:0] A,
    input [1:0] B,
    input C,
    input D,
    output [7:0] OUT
);
   assign OUT = {
        A[3:0],  // OUT[7:4]
        B[1:0],  // OUT[3:2]
        ~C,      // OUT[1]
        D        // OUT[0]
    };
endmodule