| Count | Prefix |
|---|---|
| 3,996 | b- |
| 33 | b. |
| 248 | b0 |
| 542 | b1 |
| 4,593 | b2 |
| 455 | b3 |
| 678 | b4 |
| 270 | b5 |
| 114 | b6 |
| 142 | b7 |
| 127 | b8 |
| 185 | b9 |
| 210,088 | ba |
| 11,888 | bb |
| 12,566 | bc |
| 6,780 | bd |
| 213,499 | be |
| 3,977 | bf |
| 5,332 | bg |
| 7,997 | bh |
| 150,991 | bi |
| 6,177 | bj |
| 3,994 | bk |
| 103,917 | bl |
| 9,730 | bm |
| 4,518 | bn |
| 148,079 | bo |
| 5,829 | bp |
| 496 | bq |
| 156,014 | br |
| 10,189 | bs |
| 7,406 | bt |
| 127,038 | bu |
| 3,071 | bv |
| 4,124 | bw |
| 702 | bx |
| 12,990 | by |
| 1,510 | bz |