| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an open [noun] | 707 |
|
| 2 | [prep] an [noun pl] [noun] | 234 |
|
| 3 | [prep] open [noun pl] [noun] | 38 |
|
| 4 | an open [noun pl] [noun] | 20 |
|
| 5 | [prep] an open [noun pl] | 12 |
|
