SimilarityRank
be_extremely_difficult 0.834 97037
difficult 0.772 2515
very_difficult 0.769 34974
be_not_easy 0.747 17254
be_very_hard 0.739 91214
extremely_difficult 0.696 93625
it_be_difficult 0.689 31149
it_be_very_difficult 0.675 71675
can_be_difficult 0.672 30674
be_tricky 0.670 48836
it_be_very_difficult_to 0.660 29790
be_the_most_difficult 0.658 91080
,_if_not_impossible 0.658 78666
be_tough 0.650 11759
a_difficult 0.650 12053
be_not_an_easy_task 0.648 79512
it_be_not_easy 0.636 29647
it_be_very_hard_to 0.632 86037
be_difficult_for 0.632 52554
be_difficult_to 0.631 37814
be_impossible 0.619 18147
be_not_always_easy 0.615 89460
more_difficult 0.609 14322
be_hard_to 0.608 23656
it_be_difficult_to 0.601 12556