No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a [adv] [adj] period of | 57 | |
2 | [prep] a [adv] long [noun] of | 19 | |
3 | [prep] a [adv] long [noun sg] of | 18 | |
4 | [prep] a [adv] long period [prep] | 12 | |
5 | [prep] a [adv] long period of | 12 | |
6 | [prep] [art] [adv] long period of | 12 | |
7 | [prep] a [adv] long period [prep] | 12 | |
8 | [prep] [art] [adv] long period of | 12 | |
9 | [prep] a [adv] long period of | 11 | |
10 | [prep] a [adv] long period of | 11 |