| Similarity | Rank | |
|---|---|---|
| the_major_challenge | 0.792 | 66525 |
| the_big_challenge | 0.754 | 19695 |
| the_key_challenge | 0.734 | 74955 |
| major_challenge | 0.704 | 94021 |
| the_main_problem | 0.702 | 46787 |
| another_challenge | 0.693 | 48760 |
| the_great_challenge | 0.684 | 32862 |
| big_challenge | 0.672 | 46944 |
| the_main_issue | 0.660 | 33447 |
| the_main_concern | 0.628 | 62045 |
| specific_challenge | 0.604 | 92340 |
| the_big_problem | 0.601 | 25566 |
| great_challenge | 0.599 | 59535 |
| current_challenge | 0.596 | 50315 |
| major_problem | 0.594 | 34279 |
| challenge_relate_to | 0.591 | 80453 |
| key_issue | 0.590 | 15544 |
| challenge_associate_with | 0.586 | 61107 |
| various_challenge | 0.582 | 99907 |
| the_most_important_issue | 0.581 | 75837 |
| challenge_face | 0.576 | 32972 |
| challenge | 0.572 | 222 |
| many_challenge | 0.571 | 34197 |
| the_main_problem_be | 0.570 | 96132 |
| future_challenge | 0.552 | 41206 |