| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period | 2283 |
|
| 2 | a long period | 405 |
|
| 3 | an [adj] period | 259 |
|
| 4 | a short period | 242 |
|
| 5 | a brief period | 90 |
|
| 6 | a limited period | 78 |
|
| 7 | a fixed period | 58 |
|
| 8 | a prolonged period | 55 |
|
| 9 | a certain period | 50 |
|
| 10 | a specified period | 49 |
|
| 11 | a transitional period | 48 |
|
| 12 | a given period | 46 |
|
| 13 | a extended period | 46 |
|
| 14 | a lengthy period | 42 |
|
| 15 | a five-year period | 40 |
|
| 16 | a reasonable period | 40 |
|
| 17 | a three-year period | 39 |
|
| 18 | a particular period | 37 |
|
| 19 | a considerable period | 36 |
|
| 20 | a two-year period | 33 |
|
| 21 | a indefinite period | 30 |
|
| 22 | a initial period | 30 |
|
| 23 | a difficult period | 23 |
|
| 24 | a six-month period | 20 |
|
| 25 | a continuous period | 19 |
|
| 26 | a new period | 18 |
|
| 27 | a 24-hour period | 17 |
|
| 28 | a three-month period | 17 |
|
| 29 | a four-year period | 16 |
|
| 30 | a maximum period | 15 |
|
