| Count | Prefix |
|---|---|
| 3,695 | b- |
| 29 | b. |
| 222 | b0 |
| 500 | b1 |
| 4,385 | b2 |
| 422 | b3 |
| 631 | b4 |
| 250 | b5 |
| 105 | b6 |
| 132 | b7 |
| 120 | b8 |
| 182 | b9 |
| 201,230 | ba |
| 10,971 | bb |
| 11,591 | bc |
| 6,221 | bd |
| 204,221 | be |
| 3,595 | bf |
| 4,834 | bg |
| 7,475 | bh |
| 144,905 | bi |
| 5,921 | bj |
| 3,603 | bk |
| 99,773 | bl |
| 8,819 | bm |
| 4,134 | bn |
| 142,027 | bo |
| 5,225 | bp |
| 464 | bq |
| 149,305 | br |
| 9,119 | bs |
| 6,658 | bt |
| 122,388 | bu |
| 2,776 | bv |
| 3,761 | bw |
| 666 | bx |
| 12,383 | by |
| 1,376 | bz |