| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an 18th [noun] | 9 |
|
| 2 | [prep] an 18th [noun] | 9 |
|
| 3 | an 18th [noun] [noun] | 20 |
|
| 4 | an 18th century [noun] | 20 |
|
| 5 | an 18th century [noun] | 20 |
|
| 6 | an 18th [noun sg] [noun] | 20 |
|
| 7 | an 18th [noun] [noun] | 20 |
|
| 8 | an 18th [noun] [noun sg] | 19 |
|
