SimilarityRank
be_very_difficult 0.739 37607
very_hard 0.715 41193
be_tough 0.681 11759
be_extremely_difficult 0.676 97037
be_not_easy 0.649 17254
hard 0.645 1452
difficult 0.637 2515
really_hard 0.631 64966
very_difficult 0.622 34974
it_be_not_easy 0.608 29647
be_tricky 0.607 48836
can_be_hard 0.606 97851
it_be_difficult 0.598 31149
it_be_very_difficult 0.592 71675
be_a_tough 0.585 36164
it_be_tough 0.580 29779
not_easy 0.580 65092
get_hard 0.575 65510
be_hard_to 0.573 23656
be_the_most_difficult 0.563 91080
can_be_difficult 0.559 30674
hard_as 0.553 79740
it_be_hard 0.553 12868
,_if_not_impossible 0.548 78666
a_difficult 0.544 12053