| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been a [noun] of | 1604 |
|
| 2 | [verb] been [art] source of | 52 |
|
| 3 | [verb] [be] a source of | 42 |
|
| 4 | [verb] be a source of | 42 |
|
| 5 | [verb] [been] a source of | 38 |
|
| 6 | [verb] been a source [prep] | 38 |
|
| 7 | [verb] been a source of | 38 |
|
| 8 | [verb] been a source [prep] | 38 |
|
