SimilarityRank
the_main_challenge 0.693 52376
the_big_challenge 0.687 19695
challenge 0.653 222
big_challenge 0.648 46944
the_major_challenge 0.628 66525
major_challenge 0.620 94021
the_great_challenge 0.612 32862
many_challenge 0.607 34197
great_challenge 0.607 59535
the_next_challenge 0.588 87799
another_problem 0.575 52607
a_new_challenge 0.573 76110
various_challenge 0.557 99907
new_challenge 0.555 18398
face_many_challenge 0.555 78198
the_main_problem 0.550 46787
the_big_problem 0.546 25566
challenge_associate_with 0.535 61107
challenge_relate_to 0.534 80453
another_issue 0.532 27258
specific_challenge 0.519 92340
a_dilemma 0.517 51780
these_challenge 0.515 16957
the_key_challenge 0.511 74955
current_challenge 0.508 50315