| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [is] [adj] for maintaining | 10 |
|
| 2 | [noun sg] [is] [adj] for maintaining | 10 |
|
| 3 | [is] [adj] for maintaining [art] | 6 |
|
| 4 | [is] [adj] for maintaining [art] | 6 |
|
