SimilarityRank
these_problem 0.842 12503
this_problem 0.796 4064
problem 0.776 185
of_these_problem 0.720 78749
various_problem 0.688 94278
related_problem 0.687 65450
problem_relate_to 0.685 33222
serious_problem 0.667 48894
specific_problem 0.646 57049
complex_problem 0.639 48012
these_issue 0.638 8191
problem_associate_with 0.631 33102
such_situation 0.630 73166
solve_them 0.625 89467
these_difficulty 0.623 80470
practical_problem 0.623 74534
major_problem 0.620 34279
any_problem 0.619 28370
current_problem 0.614 54692
problem_cause_by 0.607 59711
problem_with 0.607 3733
security_problem 0.601 62807
these_challenge 0.601 16957
such_issue 0.599 21237
social_problem 0.598 19159