| Similarity | Rank | |
|---|---|---|
| over_a_long_period_of | 0.679 | 50448 |
| for_a_period | 0.668 | 8259 |
| over_several_year | 0.647 | 61781 |
| over_a_number_of_year | 0.597 | 82216 |
| a_[number]_year_period | 0.589 | 93382 |
| over_[number]_month | 0.584 | 71184 |
| over_two_year | 0.580 | 46181 |
| within_a_period | 0.574 | 78704 |
| over_time | 0.572 | 2610 |
| span_of | 0.566 | 16198 |
| over_three_year | 0.557 | 43144 |
| several_year | 0.552 | 27038 |
| during_a_period | 0.546 | 36650 |
| over_many_year | 0.544 | 28027 |
| over_decade | 0.540 | 80601 |
| several_month | 0.529 | 42484 |
| several_week | 0.522 | 49332 |
| a_few_month | 0.514 | 33709 |
| a_period_of | 0.514 | 8962 |
| six_month | 0.513 | 8428 |
| over_five_year | 0.512 | 42151 |
| five_month | 0.509 | 39352 |
| time_span | 0.505 | 97197 |
| many_month | 0.505 | 82831 |
| four_month | 0.501 | 22937 |