11. Vector Concatenation

How do you plan to solve it?

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