SimilarityRank
major_problem 0.795 34279
the_big_problem 0.777 25566
the_main_issue 0.740 33447
the_main_problem_be 0.715 96132
the_main_challenge 0.702 52376
another_problem 0.694 52607
the_real_problem 0.671 29156
problem 0.653 185
the_major_challenge 0.647 66525
big_problem 0.634 39556
the_most_important_issue 0.631 75837
current_problem 0.624 54692
the_main_concern 0.623 62045
a_big_problem 0.620 88869
major_issue 0.617 31720
the_main_cause_of 0.616 84914
the_big_issue 0.613 32640
problem_relate_to 0.609 33222
problem_with 0.599 3733
the_big_challenge 0.597 19695
problem_face 0.596 83674
serious_problem 0.594 48894
major_concern 0.588 70286
another_issue 0.581 27258
various_problem 0.581 94278