| Count | Prefix |
|---|---|
| 2,574 | r- |
| 26 | r. |
| 243 | r0 |
| 422 | r1 |
| 792 | r2 |
| 527 | r3 |
| 329 | r4 |
| 103 | r5 |
| 96 | r6 |
| 117 | r7 |
| 130 | r8 |
| 83 | r9 |
| 140,235 | ra |
| 5,879 | rb |
| 9,028 | rc |
| 5,392 | rd |
| 284,648 | re |
| 4,104 | rf |
| 3,991 | rg |
| 11,692 | rh |
| 87,410 | ri |
| 3,420 | rj |
| 2,851 | rk |
| 3,322 | rl |
| 7,192 | rm |
| 3,025 | rn |
| 160,512 | ro |
| 5,615 | rp |
| 437 | rq |
| 4,021 | rr |
| 9,522 | rs |
| 7,479 | rt |
| 50,545 | ru |
| 4,274 | rv |
| 3,269 | rw |
| 3,169 | rx |
| 10,239 | ry |
| 1,043 | rz |