SimilarityRank
big_problem 0.799 39556
the_main_problem 0.777 46787
major_problem 0.776 34279
the_big_issue 0.748 32640
the_real_problem 0.743 29156
the_main_problem_be 0.723 96132
a_big_problem 0.720 88869
another_problem 0.712 52607
problem 0.673 185
the_big_challenge 0.667 19695
big_issue 0.639 68319
serious_problem 0.635 48894
problem_with 0.632 3733
big_challenge 0.628 46944
the_main_issue 0.622 33447
the_major_challenge 0.603 66525
the_great_challenge 0.601 32862
another_problem_be 0.601 84433
the_main_challenge 0.601 52376
another_issue 0.598 27258
major_issue 0.588 31720
the_most_important_issue 0.587 75837
problem_face 0.585 83674
be_a_serious_problem 0.581 99535
problem_with_this 0.573 51399