SimilarityRank
be_unknown 0.826 8723
remain_unknown_. 0.780 83257
be_not_know 0.772 21842
remain_a_mystery 0.764 70041
be_unclear 0.689 18231
remain_unclear_. 0.665 61353
be_a_mystery 0.644 49852
be_not_clear 0.637 25766
be_uncertain 0.628 25526
we_do_not_know 0.618 21798
no_one_know 0.605 42689
it_be_unknown 0.571 73475
be_already_know 0.546 79443
nobody_know 0.536 74533
not_know 0.523 17980
know_about 0.523 5185
it_be_unclear 0.523 96477
be_unaware_of 0.513 36659
be_not_know_to 0.512 78162
unknown 0.512 3389
do_not_reveal 0.506 84708
little_know 0.505 66255
a_mystery 0.500 26924
do_not_know 0.492 10490
be_not_aware_of 0.490 45005