| Similarity | Rank | |
|---|---|---|
| be_tough | 0.779 | 11759 |
| it_be_a_tough | 0.746 | 93393 |
| a_tough | 0.721 | 26323 |
| a_difficult | 0.698 | 12053 |
| tough | 0.683 | 4367 |
| it_be_tough | 0.612 | 29779 |
| be_a_challenging | 0.597 | 67849 |
| be_very_hard | 0.585 | 91214 |
| be_the_most_difficult | 0.581 | 91080 |
| a_tricky | 0.572 | 79167 |
| be_quite_a | 0.569 | 25697 |
| hard | 0.566 | 1452 |
| be_an_interesting | 0.558 | 29539 |
| difficult | 0.557 | 2515 |
| be_very_difficult | 0.554 | 37607 |
| be_not_easy | 0.551 | 17254 |
| it_be_not_easy | 0.547 | 29647 |
| very_hard | 0.537 | 41193 |
| the_most_challenging | 0.530 | 54484 |
| the_most_difficult | 0.515 | 35489 |
| really_hard | 0.513 | 64966 |
| very_difficult | 0.512 | 34974 |
| rough | 0.509 | 7325 |
| it_be_a_long | 0.507 | 52581 |
| be_a_very_good | 0.506 | 36953 |