Please try moving the position of the matrix using buttons or the keyboard. This library assists in determining the destination position.
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 31 | 32 | 33 | 34 | NULL | 36 | 37 | NULL |
| 41 | 42 | 43 | 44 | 45 | 46 | NULL | NULL |
| 51 | 52 | 53 | 54 | 55 | NULL | NULL | 58 |