| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [adv] [adj] [noun] of | 1264 |
|
| 2 | an [adv] [adj] [noun sg] of | 1243 |
|
| 3 | [art] [adv] [adj] period of | 123 |
|
| 4 | [art] [adv] [adj] period of | 123 |
|
| 5 | a [adv] [adj] period of | 94 |
|
| 6 | an [adv] [adj] period [prep] | 16 |
|
| 7 | an [adv] [adj] period of | 7 |
|
