| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [det] a [noun sg] | 5978 |
|
| 2 | required [prep] [det] [noun sg] | 143 |
|
| 3 | required [prep] a [noun sg] | 134 |
|
| 4 | required [prep] [det] a | 13 |
|
