| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] of [adj] years | 2113 |
|
| 2 | period of [adj] [noun] | 1911 |
|
| 3 | period of [adj] [noun pl] | 796 |
|
| 4 | period of [adj] year | 377 |
|
| 5 | period [prep] [adj] years | 357 |
|
| 6 | period [prep] [adj] years | 357 |
|
| 7 | period of [adj] years | 348 |
|
