| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [prep] a [adj] period | 229 |
|
| 2 | [noun pl] [prep] a [adj] period | 203 |
|
| 3 | [noun pl] [prep] a long [noun] | 178 |
|
| 4 | [noun pl] [prep] a long [noun sg] | 174 |
|
| 5 | [noun] [prep] a long period | 137 |
|
| 6 | [noun pl] [prep] a long period | 42 |
|
| 7 | [noun pl] [prep] [art] long period | 30 |
|
| 8 | [noun pl] [prep] a long period | 29 |
|
