| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of | 889 |
|
| 2 | a [adj] period of | 842 |
|
| 3 | a long period of | 205 |
|
| 4 | a long period of | 183 |
|
| 5 | an [adj] period of | 112 |
|
| 6 | a short period of | 91 |
|
| 7 | a short period of | 84 |
|
| 8 | a [adj -er] period of | 58 |
|
| 9 | a brief period of | 34 |
|
| 10 | a brief period of | 33 |
|
| 11 | a prolonged period of | 30 |
|
| 12 | a prolonged period of | 30 |
|
| 13 | a fixed period of | 27 |
|
| 14 | a fixed period of | 27 |
|
| 15 | a considerable period of | 23 |
|
| 16 | a considerable period of | 23 |
|
| 17 | a initial period of | 22 |
|
| 18 | a certain period of | 22 |
|
| 19 | a initial period of | 22 |
|
| 20 | a longer period of | 22 |
|
| 21 | a certain period of | 22 |
|
| 22 | a further period of | 21 |
|
| 23 | a far period of | 21 |
|
| 24 | a continuous period of | 19 |
|
| 25 | a continuous period of | 19 |
|
| 26 | a lengthy period of | 19 |
|
| 27 | a lengthy period of | 19 |
|
| 28 | a limited period of | 19 |
|
| 29 | a limited period of | 19 |
|
| 30 | a extended period of | 18 |
|
