| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | two years i | 54 |
|
| 2 | three years i | 30 |
|
| 3 | five years i | 23 |
|
| 4 | ten years i | 18 |
|
| 5 | twenty years i | 16 |
|
| 6 | four years i | 16 |
|
| 7 | seven years i | 15 |
|
| 8 | fifteen years i | 8 |
|
| 9 | thirty years i | 7 |
|
| 10 | 30 years i | 6 |
|
| 11 | eight years i | 5 |
|
