| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it has [been] [prep] a | 5 |
|
| 2 | it has [been] [verb] [prep] a | 144 |
|
| 3 | it has [been] [vb pp] [prep] a | 141 |
|
| 4 | it has [been] used [prep] a | 11 |
|
| 5 | it has [been] use [prep] a | 11 |
|
| 6 | it has [been] described [prep] a | 6 |
|
| 7 | it has [been] describe [prep] a | 6 |
|
| 8 | it has [been] known [prep] a | 5 |
|
| 9 | it has [been] [adj] [prep] a | 5 |
|
| 10 | it has [been] know [prep] a | 5 |
|
