| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] minimum of [num] years | 22 |
|
| 2 | [prep] a minimum [prep] [num] years | 21 |
|
| 3 | for [art] minimum [prep] [num] years | 18 |
|
| 4 | [prep] [art] minimum [prep] two years | 7 |
|
