| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have developed [art] system | 13 |
|
| 2 | have developed a system | 12 |
|
| 3 | have developed a system | 12 |
|
| 4 | has developed [art] system | 7 |
|
| 5 | have developed [art] system | 5 |
|
