| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been built [prep] | 61 |
|
| 2 | been built up [prep] | 58 |
|
| 3 | has been built up | 39 |
|
| 4 | has built up [prep] | 23 |
|
| 5 | has been up [prep] | 20 |
|
