| Count | Prefix |
|---|---|
| 2,372 | r- |
| 24 | r. |
| 228 | r0 |
| 384 | r1 |
| 722 | r2 |
| 484 | r3 |
| 305 | r4 |
| 95 | r5 |
| 88 | r6 |
| 99 | r7 |
| 121 | r8 |
| 79 | r9 |
| 133,818 | ra |
| 5,329 | rb |
| 8,312 | rc |
| 4,882 | rd |
| 271,943 | re |
| 3,783 | rf |
| 3,635 | rg |
| 11,113 | rh |
| 83,470 | ri |
| 3,271 | rj |
| 2,570 | rk |
| 3,095 | rl |
| 6,548 | rm |
| 2,758 | rn |
| 153,518 | ro |
| 5,139 | rp |
| 407 | rq |
| 3,749 | rr |
| 8,576 | rs |
| 6,778 | rt |
| 48,204 | ru |
| 4,033 | rv |
| 3,013 | rw |
| 3,042 | rx |
| 9,846 | ry |
| 903 | rz |