SimilarityRank
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