| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an [adj] period [prep] | 98 |
|
| 2 | [prep] an [adj] period [prep] | 88 |
|
| 3 | [prep] an [adj] period of | 74 |
|
| 4 | for an [adj] period [prep] | 48 |
|
| 5 | for an [adj] period [prep] | 48 |
|
| 6 | [prep] an initial period [prep] | 15 |
|
| 7 | [prep] an initial period [prep] | 15 |
|
| 8 | [prep] an extended period [prep] | 13 |
|
| 9 | [prep] an extended period [prep] | 13 |
|
| 10 | [prep] an early period [prep] | 11 |
|
| 11 | [prep] an [adj] period in | 11 |
|
| 12 | [prep] an earlier period [prep] | 10 |
|
| 13 | [prep] an [adj -er] period [prep] | 10 |
|
| 14 | [prep] an indefinite period [prep] | 8 |
|
| 15 | [prep] an indefinite period [prep] | 8 |
|
| 16 | over an [adj] period [prep] | 7 |
|
| 17 | after an [adj] period [prep] | 7 |
|
| 18 | after an [adj] period [prep] | 7 |
|
| 19 | to an [adj] period [prep] | 7 |
|
| 20 | to an [adj] period [prep] | 7 |
|
| 21 | over an [adj] period [prep] | 7 |
|
| 22 | [prep] an experimental period [prep] | 6 |
|
| 23 | [prep] an experimental period [prep] | 6 |
|
| 24 | in an [adj] period [prep] | 6 |
|
| 25 | in an [adj] period [prep] | 6 |
|
| 26 | with an [adj] period [prep] | 5 |
|
| 27 | [prep] an agreed period [prep] | 5 |
|
| 28 | during an [adj] period [prep] | 5 |
|
| 29 | during an [adj] period [prep] | 5 |
|
| 30 | with an [adj] period [prep] | 5 |
|
