No | Pattern | Freq | Relations |
---|---|---|---|
1 | [vb pp] a long [noun] of | 30 | |
2 | [vb pp] a [adj] period of | 16 | |
3 | [verb] a long period of | 16 | |
4 | [vb pp] a long period [prep] | 9 | |
5 | [vb pp] a long period [prep] | 9 | |
6 | [vb pp] [art] long period of | 6 | |
7 | [vb pp] a long period of | 5 |