SimilarityRank
the_main_problem 0.795 46787
the_big_problem 0.776 25566
serious_problem 0.775 48894
big_problem 0.768 39556
problem 0.765 185
major_issue 0.723 31720
problem_with 0.712 3733
another_problem 0.703 52607
problem_face 0.687 83674
problem_relate_to 0.684 33222
a_big_problem 0.678 88869
current_problem 0.668 54692
the_big_issue 0.664 32640
major_concern 0.660 70286
problem_associate_with 0.660 33102
the_real_problem 0.656 29156
major_challenge 0.642 94021
various_problem 0.640 94278
the_main_issue 0.635 33447
the_major_challenge 0.634 66525
big_issue 0.634 68319
these_problem 0.626 12503
such_problem 0.620 41208
the_main_problem_be 0.610 96132
related_problem 0.610 65450