| Count | Prefix |
|---|---|
| 85 | ob- |
| 12 | ob. |
| 1 | ob0 |
| 18 | ob1 |
| 9 | ob2 |
| 5 | ob3 |
| 3 | ob4 |
| 7 | ob5 |
| 1 | ob6 |
| 4 | ob7 |
| 3 | ob8 |
| 4 | ob9 |
| 867 | oba |
| 133 | obb |
| 277 | obc |
| 204 | obd |
| 4,362 | obe |
| 85 | obf |
| 291 | obg |
| 88 | obh |
| 950 | obi |
| 2,117 | obj |
| 50 | obk |
| 813 | obl |
| 146 | obm |
| 134 | obn |
| 736 | obo |
| 109 | obp |
| 10 | obq |
| 1,136 | obr |
| 2,742 | obs |
| 267 | obt |
| 304 | obu |
| 227 | obv |
| 55 | obw |
| 261 | obx |
| 93 | oby |
| 115 | obz |