SimilarityRank
another_problem_be 0.736 84433
the_big_problem 0.723 25566
the_main_problem 0.715 46787
the_real_problem 0.636 29156
the_reason_for_this_be 0.615 34530
major_problem 0.610 34279
another_problem 0.597 52607
the_main_issue 0.578 33447
be_due_to_the_fact_that 0.570 42382
the_main_challenge 0.570 52376
big_problem 0.558 39556
there_be_a_problem_with 0.556 97972
the_main_reason 0.551 25916
unfortunately_, 0.541 2066
there_be_a_problem 0.538 50362
problem_with_this 0.534 51399
the_main_concern 0.534 62045
a_big_problem 0.531 88869
the_main_reason_for 0.531 33513
be_problematic 0.524 27860
the_big_issue 0.518 32640
problem 0.518 185
problem_with 0.512 3733
however_,_due_to 0.503 32291
it_do_not_help 0.503 51507