| Count | Prefix |
|---|---|
| 4 | easy-1 |
| 7 | easy-2 |
| 1 | easy-3 |
| 5 | easy-4 |
| 1 | easy-8 |
| 84 | easy-a |
| 89 | easy-b |
| 181 | easy-c |
| 98 | easy-d |
| 74 | easy-e |
| 80 | easy-f |
| 48 | easy-g |
| 55 | easy-h |
| 46 | easy-i |
| 17 | easy-j |
| 12 | easy-k |
| 91 | easy-l |
| 85 | easy-m |
| 25 | easy-n |
| 38 | easy-o |
| 125 | easy-p |
| 7 | easy-q |
| 90 | easy-r |
| 193 | easy-s |
| 134 | easy-t |
| 14 | easy-u |
| 29 | easy-v |
| 84 | easy-w |
| 3 | easy-x |
| 7 | easy-y |
| 1 | easy-z |