| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a long [noun] of | 1047 |
|
| 2 | a [adj] period of | 954 |
|
| 3 | a [adj] period of | 889 |
|
| 4 | a long period [prep] | 216 |
|
| 5 | a long period [prep] | 216 |
|
| 6 | [art] long period of | 215 |
|
| 7 | a long period of | 205 |
|
| 8 | a long period of | 183 |
|
