| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system be the | 150 |
|
| 2 | system is the | 101 |
|
| 3 | system [is] the | 101 |
|
| 4 | system [was/were] the | 34 |
|
| 5 | system was the | 32 |
|
| 6 | system [am/are] the | 14 |
|
| 7 | system are the | 14 |
|
