SimilarityRank
the_great_challenge 0.842 32862
big_challenge 0.823 46944
the_major_challenge 0.759 66525
the_main_challenge 0.754 52376
great_challenge 0.708 59535
another_challenge 0.687 48760
major_challenge 0.670 94021
the_big_problem 0.667 25566
the_key_challenge 0.660 74955
many_challenge 0.647 34197
the_hard_part_of 0.609 73040
the_hard_thing 0.599 86990
the_main_problem 0.597 46787
the_big_issue 0.596 32640
challenge 0.592 222
big_problem 0.590 39556
the_hard_part 0.584 66943
be_the_most_difficult 0.580 91080
the_most_challenging 0.575 54484
face_many_challenge 0.565 78198
the_main_concern 0.554 62045
the_most_important_issue 0.549 75837
major_problem 0.548 34279
the_most_difficult 0.541 35489
challenge_face 0.536 32972