SimilarityRank
remain_unclear_. 0.797 61353
remain_unknown 0.780 95834
be_unknown 0.772 8723
be_not_know 0.744 21842
remain_a_mystery 0.721 70041
be_unclear 0.699 18231
be_not_clear 0.640 25766
it_be_unknown 0.587 73475
be_uncertain 0.584 25526
be_a_mystery 0.547 49852
have_be_implicate_in 0.544 83034
we_do_not_know 0.540 21798
no_one_know 0.530 42689
it_be_unclear 0.527 96477
believe_to 0.514 4503
know_about 0.499 5185
be_implicate_in 0.499 57259
nobody_know 0.492 74533
it_be_not_clear_whether 0.488 72966
be_not_know_to 0.478 78162
be_already_know 0.476 79443
it_be_unclear_whether 0.474 62460
implicate 0.472 22842
may_explain 0.471 74264
be_well_document 0.470 39072