| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period of [adj] [noun] | 190 |
|
| 2 | over a period of [adj] [noun pl] | 186 |
|
| 3 | over a period of [adj] year | 112 |
|
| 4 | over a period of [adj] years | 109 |
|
| 5 | over a period of [adj] month | 32 |
|
| 6 | over a period of [adj] months | 32 |
|
| 7 | over a period of [adj] week | 17 |
|
| 8 | over a period of [adj] weeks | 17 |
|
| 9 | over a period of [adj] [conj] | 16 |
|
| 10 | over a period of [adj] day | 13 |
|
| 11 | over a period of [adj] [coord] | 13 |
|
| 12 | over a period of [adj] days | 12 |
|
| 13 | over a period of [adj] or | 12 |
|
| 14 | over a period of [adj] or | 12 |
|
| 15 | over a period of [adj] [adj] | 8 |
|
| 16 | over a period of [adj] [prep] | 6 |
|
| 17 | over a period of [adj] [num] | 6 |
|
| 18 | over a period of [adj] [prep] | 6 |
|
| 19 | over a period of [adj] minutes | 5 |
|
| 20 | over a period of [adj] to | 5 |
|
| 21 | over a period of [adj] minute | 5 |
|
| 22 | over a period of [adj] to | 5 |
|
| 23 | [noun] over a period of [adj] | 108 |
|
| 24 | [noun sg] over a period of [adj] | 53 |
|
| 25 | [noun pl] over a period of [adj] | 45 |
|
| 26 | [verb] over a period of [adj] | 32 |
|
| 27 | [vb pp] over a period of [adj] | 30 |
|
| 28 | [adv] over a period of [adj] | 14 |
|
| 29 | [adv] over a period of [adj] | 10 |
|
| 30 | [adj] over a period of [adj] | 7 |
|
