| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv prt] over a period | 21 |
|
| 2 | [vb pp] [adv prt] over a period | 14 |
|
| 3 | build [adv prt] over a period | 5 |
|
| 4 | built [adv prt] over a period | 5 |
|
| 5 | [adv prt] over a [adj] period | 14 |
|
| 6 | [adv prt] over a [adj] period | 13 |
|
| 7 | [adv prt] over a long period | 5 |
|
| 8 | [adv prt] over a period [prep] | 25 |
|
| 9 | [adv prt] over a period of | 25 |
|
| 10 | [adv prt] over a period of | 25 |
|
| 11 | [adv prt] over a period [prep] | 25 |
|
