| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] [prep] a [adj] years | 27 |
|
| 2 | a [noun sg] [prep] a [adj] years | 26 |
|
| 3 | a period [prep] a [adj] [noun] | 21 |
|
| 4 | a period [prep] a [adj] [noun pl] | 14 |
|
| 5 | a period [prep] a [adj] years | 5 |
|
| 6 | a period [prep] a [adj] year | 5 |
|
| 7 | a period [prep] [art] [adj] years | 5 |
|
| 8 | [art] period [prep] a [adj] years | 5 |
|
| 9 | [art] period [prep] a [adj] years | 5 |
|
| 10 | a period [prep] a [adj] years | 5 |
|
