|------------------------|------------------------|
| LEFT_HAND_KEYS | RIGHT_HAND_KEYS |
| | |
| 0 1 2 3 4 | 5 6 7 8 9 |
| 10 11 12 13 14 | 15 16 17 18 19 |
| 20 21 22 23 24 25 | 26 27 28 29 30 31 |
| 32 33 34 | 35 36 37 |
|------------------------|------------------------|