How do you plan to solve it?
/*Write your code here*/ module concat8_packer( input [3:0] A, input [1:0] B, input C, input 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