SimilarityRank
the_major_challenge 0.766 66525
big_challenge 0.728 46944
great_challenge 0.725 59535
the_main_challenge 0.704 52376
many_challenge 0.699 34197
the_great_challenge 0.689 32862
the_key_challenge 0.680 74955
the_big_challenge 0.670 19695
challenge 0.647 222
major_problem 0.642 34279
challenge_face 0.641 32972
current_challenge 0.640 50315
future_challenge 0.626 41206
face_many_challenge 0.623 78198
another_challenge 0.620 48760
various_challenge 0.617 99907
challenge_associate_with 0.611 61107
challenge_relate_to 0.609 80453
specific_challenge 0.607 92340
these_challenge 0.595 16957
new_challenge 0.590 18398
common_challenge 0.587 99524
major_concern 0.587 70286
problem_face 0.584 83674
that_we_face 0.574 59337