| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period of [adj] | 252 |
|
| 2 | in a period of [adj] | 54 |
|
| 3 | in a period of [adj] | 54 |
|
| 4 | after a period of [adj] | 46 |
|
| 5 | after a period of [adj] | 46 |
|
| 6 | during a period of [adj] | 39 |
|
| 7 | during a period of [adj] | 39 |
|
| 8 | of a period of [adj] | 18 |
|
| 9 | of a period of [adj] | 18 |
|
| 10 | by a period of [adj] | 18 |
|
| 11 | by a period of [adj] | 18 |
|
| 12 | through a period of [adj] | 17 |
|
| 13 | through a period of [adj] | 17 |
|
| 14 | [prep] a period of rapid | 12 |
|
| 15 | with a period of [adj] | 11 |
|
| 16 | as a period of [adj] | 11 |
|
| 17 | with a period of [adj] | 11 |
|
| 18 | as a period of [adj] | 11 |
|
| 19 | [prep] a period of relative | 10 |
|
| 20 | [prep] a period of high | 10 |
|
| 21 | [prep] a period of economic | 10 |
|
| 22 | for a period of [adj] | 8 |
|
| 23 | for a period of [adj] | 8 |
|
| 24 | [prep] a period of great | 8 |
|
| 25 | [prep] a period of prolonged | 8 |
|
| 26 | to a period of [adj] | 7 |
|
| 27 | [prep] a period of sustained | 7 |
|
| 28 | to a period of [adj] | 7 |
|
| 29 | [prep] a period of considerable | 6 |
|
| 30 | [prep] a period of continental | 5 |
|
