SimilarityRank
about_[number]_year_ago 0.826 22341
some_[number]_year_ago 0.774 44893
over_[number]_year_ago 0.707 22327
[number]_year_ago 0.696 3595
more_than_[number]_year_ago 0.673 24310
thousand_of_year_ago 0.667 91960
[number]_million_year_ago 0.649 80067
almost_[number]_year_ago 0.625 51448
nearly_[number]_year_ago 0.612 48159
[number]_year_before 0.592 47074
the_[number]_century_ad 0.590 97270
a_long_time_ago 0.570 22554
many_year_ago 0.569 15620
the_Bronze_Age 0.559 84065
[number]_BC 0.554 34516
for_about_[number]_year 0.548 30875
a_few_year_ago 0.545 7726
in_the_late_[number]_century 0.544 30207
in_the_late_1980 0.540 29771
year_ago 0.539 6831
around_[number]_year 0.539 56380
in_the_1980 0.539 8174
century_ago 0.537 67706
in_the_late_1970 0.537 36780
at_about_the_same_time 0.536 70987