| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [noun sg] period [prep] [adj] years | 12 |
|
| 2 | [art] [noun sg] period [prep] [adj] years | 12 |
|
| 3 | a [noun sg] period [prep] [adj] years | 11 |
|
| 4 | a [noun sg] period [prep] [adj] years | 9 |
|
| 5 | [adj] [noun sg] period [prep] [adj] years | 6 |
|
| 6 | [adj] [noun sg] period [prep] [adj] years | 6 |
|
