SimilarityRank
the_most_challenging 0.808 54484
be_the_most_difficult 0.760 91080
difficult 0.694 2515
a_difficult 0.682 12053
the_most_complex 0.667 51425
very_difficult 0.633 34974
extremely_difficult 0.617 93625
the_most_critical 0.603 50569
tough 0.593 4367
the_most_rewarding 0.592 96855
tricky 0.588 23559
more_difficult 0.585 14322
challenging 0.581 6371
the_hard_thing 0.572 86990
the_great_challenge 0.569 32862
probably_one_of 0.566 72637
be_extremely_difficult 0.565 97037
more_challenging 0.565 31394
the_most_dangerous 0.565 40783
daunting 0.550 43508
be_very_difficult 0.546 37607
the_hard_part_of 0.542 73040
the_big_challenge 0.541 19695
the_most_important 0.539 3938
the_hard_part 0.529 66943