No | Pattern | Freq | Relations |
---|---|---|---|
1 | [adv prt] a [adj] period [prep] | 25 | |
2 | [adv prt] a [adj] period [prep] | 25 | |
3 | [adv prt] a [adj] period [prep] | 23 | |
4 | [adv prt] a [adj] period of | 21 | |
5 | [adv prt] a [adj] period of | 21 | |
6 | over a [adj] period [prep] | 21 | |
7 | [adv prt] a long period [prep] | 9 | |
8 | [adv prt] a long period [prep] | 9 |