SimilarityRank
remain_a_mystery 0.743 70041
a_mystery 0.692 26924
remain_unknown 0.644 95834
no_one_know 0.623 42689
be_unknown 0.618 8723
mystery 0.589 4754
mystery_of 0.589 9142
nobody_know 0.575 74533
mysterious 0.561 8906
we_do_not_know 0.557 21798
be_not_know 0.551 21842
remain_unknown_. 0.547 83257
have_no_idea 0.537 68416
a_secret 0.535 8979
it_be_unknown 0.533 73475
be_beyond_me 0.529 80936
be_unclear 0.510 18231
never_know 0.509 62448
I_have_no_idea 0.507 27343
he_do_not_know 0.505 53219
be_not_clear 0.502 25766
do_not_know 0.502 10490
not_know 0.501 17980
secret 0.492 1938
puzzling 0.484 48230