| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an operating system | 39 |
|
| 2 | an expert system | 37 |
|
| 3 | an information system | 21 |
|
| 4 | an education system | 12 |
|
| 5 | an alarm system | 12 |
|
| 6 | an accounting system | 9 |
|
| 7 | an idea-handling system | 5 |
|
