| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [adj] period [prep] | 141 |
|
| 2 | an [adj] period of | 112 |
|
| 3 | an initial period [prep] | 23 |
|
| 4 | an initial period [prep] | 23 |
|
| 5 | an extended period [prep] | 21 |
|
| 6 | an extended period [prep] | 21 |
|
| 7 | an [adj] period in | 18 |
|
| 8 | an early period [prep] | 11 |
|
| 9 | an indefinite period [prep] | 10 |
|
| 10 | an [adj -er] period [prep] | 10 |
|
| 11 | an earlier period [prep] | 10 |
|
| 12 | an indefinite period [prep] | 10 |
|
| 13 | an [adj] period for | 9 |
|
| 14 | an experimental period [prep] | 6 |
|
| 15 | an experimental period [prep] | 6 |
|
| 16 | an agreed period [prep] | 5 |
|
| 17 | an agreed period [prep] | 5 |
|
