| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been a [adj] [noun sg] | 4405 |
|
| 2 | undergoing a [adj] [noun sg] | 43 |
|
| 3 | been undergoing [adj] [noun sg] | 8 |
|
| 4 | been undergoing a [adj] | 7 |
|
