| Similarity | Rank | |
|---|---|---|
| compulsory | 0.699 | 17415 |
| mandatory | 0.639 | 7238 |
| be_compulsory | 0.584 | 49804 |
| requisite | 0.541 | 18411 |
| be_mandatory | 0.513 | 18140 |
| customary | 0.495 | 17532 |
| optional | 0.493 | 6363 |
| gratuitous | 0.492 | 69474 |
| the_usual | 0.471 | 6066 |
| required | 0.451 | 5608 |
| permissible | 0.450 | 52104 |
| superfluous | 0.449 | 47889 |
| stipulate | 0.449 | 25281 |
| be_optional | 0.447 | 16185 |
| an_optional | 0.446 | 27198 |
| oblige | 0.442 | 24043 |
| be_mandatory_for | 0.441 | 51313 |
| aforementioned | 0.441 | 69688 |
| an_obligation | 0.439 | 95606 |
| obligation | 0.436 | 4134 |
| full-on | 0.434 | 99583 |
| formality | 0.426 | 22618 |
| necessary | 0.424 | 2050 |
| a_proper | 0.422 | 12145 |
| it_be_mandatory | 0.419 | 93758 |