SimilarityRank
problem 0.691 185
the_real_problem 0.656 29156
practical_problem 0.640 74534
specific_problem 0.630 57049
big_problem 0.614 39556
major_problem 0.609 34279
current_problem 0.606 54692
the_real_issue 0.599 32975
social_problem 0.599 19159
complex_problem 0.597 48012
serious_problem 0.586 48894
problem_we_face 0.578 98636
these_problem 0.577 12503
political_problem 0.570 63987
real_business 0.568 96958
problem_with 0.565 3733
those_issue 0.561 21616
economic_problem 0.561 38699
real_situation 0.559 70162
problem_face 0.559 83674
various_problem 0.555 94278
serious_issue 0.554 86503
solve_them 0.550 89467
big_issue 0.550 68319
a_big_problem 0.545 88869