| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period of | 137 |
|
| 2 | over a [adj] period of | 128 |
|
| 3 | over a long period of | 84 |
|
| 4 | over a long period of | 77 |
|
| 5 | over a [adj -er] period of | 9 |
|
| 6 | over a prolonged period of | 8 |
|
| 7 | over a short period of | 8 |
|
| 8 | over a prolonged period of | 8 |
|
| 9 | over a considerable period of | 7 |
|
| 10 | over a short period of | 7 |
|
| 11 | over a longer period of | 7 |
|
| 12 | over a considerable period of | 7 |
|
| 13 | over a [noun sg] period of | 5 |
|
| 14 | over a given period of | 5 |
|
| 15 | over a given period of | 5 |
|
| 16 | over a [noun] period of | 5 |
|
| 17 | [noun] over a period of | 289 |
|
| 18 | [noun sg] over a period of | 165 |
|
| 19 | [noun pl] over a period of | 102 |
|
| 20 | [verb] over a period of | 75 |
|
| 21 | [vb pp] over a period of | 70 |
|
| 22 | [adv] over a period of | 60 |
|
| 23 | [adv] over a period of | 34 |
|
| 24 | [adj] over a period of | 27 |
|
| 25 | [conj] over a period of | 25 |
|
| 26 | [adv prt] over a period of | 25 |
|
| 27 | [coord] over a period of | 18 |
|
| 28 | [adj] over a period of | 18 |
|
| 29 | and over a period of | 12 |
|
| 30 | [noun prp] over a period of | 12 |
|
