SimilarityRank
remain_unknown 0.764 95834
be_a_mystery 0.743 49852
remain_unknown_. 0.721 83257
be_unknown 0.720 8723
be_not_know 0.673 21842
remain_unclear_. 0.655 61353
be_unclear 0.643 18231
it_be_unknown 0.615 73475
be_not_clear 0.610 25766
we_do_not_know 0.601 21798
no_one_know 0.580 42689
a_mystery 0.572 26924
nobody_know 0.558 74533
mysterious 0.549 8906
be_uncertain 0.534 25526
be_already_know 0.505 79443
enigmatic 0.504 36412
it_be_hard_to_say 0.502 62167
reveal_about 0.499 75689
elusive 0.498 19816
now_know 0.497 19165
do_not_explain 0.494 94495
only_know 0.493 20973
mystery_of 0.490 9142
have_no_idea 0.487 68416