| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a period of [noun sg] | 770 |
|
| 2 | a period of time | 284 |
|
| 3 | a period of time | 284 |
|
| 4 | a period of [noun pl] | 138 |
|
| 5 | a period of year | 78 |
|
| 6 | a period of years | 77 |
|
| 7 | a period of weeks | 22 |
|
| 8 | a period of months | 22 |
|
| 9 | a period of week | 22 |
|
| 10 | a period of month | 22 |
|
| 11 | a period of transition | 17 |
|
| 12 | a period of transition | 17 |
|
| 13 | a period of consolidation | 13 |
|
| 14 | a period of consolidation | 13 |
|
| 15 | a period of stability | 10 |
|
| 16 | a period of study | 10 |
|
| 17 | a period of study | 10 |
|
| 18 | a period of stability | 10 |
|
| 19 | a period of consultation | 9 |
|
| 20 | a period of change | 9 |
|
| 21 | a period of change | 9 |
|
| 22 | a period of inflation | 9 |
|
| 23 | a period of inflation | 9 |
|
| 24 | a period of consultation | 9 |
|
| 25 | a period of crisis | 8 |
|
| 26 | a period of growth | 8 |
|
| 27 | a period of crisis | 8 |
|
| 28 | a period of unemployment | 8 |
|
| 29 | a period of uncertainty | 8 |
|
| 30 | a period of growth | 8 |
|
