| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period [prep] | 628 |
|
| 2 | over a period [prep] | 628 |
|
| 3 | over a period of | 617 |
|
| 4 | over a period of | 617 |
|
| 5 | over a period [verb] | 7 |
|
| 6 | over a period [adv] | 6 |
|
| 7 | over a period [conj] | 6 |
|
| 8 | over a period [noun] | 5 |
|
| 9 | over a period [adv] | 5 |
|
| 10 | [noun] over a period | 311 |
|
| 11 | [noun sg] over a period | 180 |
|
| 12 | [noun pl] over a period | 109 |
|
| 13 | [verb] over a period | 83 |
|
| 14 | [vb pp] over a period | 78 |
|
| 15 | [adv] over a period | 69 |
|
| 16 | [adv] over a period | 39 |
|
| 17 | [conj] over a period | 29 |
|
| 18 | [adv prt] over a period | 29 |
|
| 19 | [adj] over a period | 29 |
|
| 20 | [coord] over a period | 20 |
|
| 21 | [adj] over a period | 20 |
|
| 22 | and over a period | 14 |
|
| 23 | and over a period | 14 |
|
| 24 | [noun prp] over a period | 12 |
|
| 25 | place over a period | 10 |
|
| 26 | place over a period | 9 |
|
| 27 | [n mass] over a period | 9 |
|
| 28 | up over a period | 9 |
|
| 29 | up over a period | 9 |
|
| 30 | [pron] over a period | 9 |
|
