| Count | Prefix |
|---|---|
| 623 | is- |
| 39 | is. |
| 8 | is0 |
| 37 | is1 |
| 76 | is2 |
| 35 | is3 |
| 61 | is4 |
| 10 | is5 |
| 10 | is6 |
| 12 | is7 |
| 10 | is8 |
| 9 | is9 |
| 4,892 | isa |
| 712 | isb |
| 1,910 | isc |
| 758 | isd |
| 3,520 | ise |
| 497 | isf |
| 571 | isg |
| 2,876 | ish |
| 2,664 | isi |
| 106 | isj |
| 913 | isk |
| 9,922 | isl |
| 1,618 | ism |
| 555 | isn |
| 4,922 | iso |
| 2,832 | isp |
| 133 | isq |
| 2,535 | isr |
| 2,324 | iss |
| 4,845 | ist |
| 1,152 | isu |
| 211 | isv |
| 412 | isw |
| 38 | isx |
| 423 | isy |
| 59 | isz |