
Implement the circuit described by the Karnaugh map below.

             ab
  cd   00  01  11  10
  00 | 0 | 1 | 0 | 1 |
  01 | 1 | 0 | 1 | 0 |
  11 | 0 | 1 | 0 | 1 |
  10 | 1 | 0 | 1 | 0 |

module TopModule (
  input a,
  input b,
  input c,
  input d,
  output reg out
);

