| Similarity | Rank | |
|---|---|---|
| the_major_challenge | 0.798 | 66525 |
| the_main_challenge | 0.734 | 52376 |
| major_challenge | 0.680 | 94021 |
| current_challenge | 0.674 | 50315 |
| the_great_challenge | 0.670 | 32862 |
| challenge_face | 0.667 | 32972 |
| the_big_challenge | 0.660 | 19695 |
| key_issue | 0.659 | 15544 |
| the_challenge_face | 0.638 | 22143 |
| specific_challenge | 0.622 | 92340 |
| challenge_associate_with | 0.620 | 61107 |
| challenge_face_by | 0.616 | 66867 |
| various_challenge | 0.607 | 99907 |
| common_challenge | 0.602 | 99524 |
| challenge_relate_to | 0.598 | 80453 |
| the_challenge_face_by | 0.590 | 42818 |
| big_challenge | 0.586 | 46944 |
| many_challenge | 0.586 | 34197 |
| great_challenge | 0.584 | 59535 |
| future_challenge | 0.580 | 41206 |
| the_main_issue | 0.579 | 33447 |
| these_challenge | 0.578 | 16957 |
| the_main_problem | 0.569 | 46787 |
| challenge_we_face | 0.569 | 47011 |
| the_most_important_issue | 0.560 | 75837 |