No | Pattern | Freq | Relations |
---|---|---|---|
1 | a long period [prep] [noun sg] | 172 | |
2 | a long period of [noun sg] | 164 | |
3 | a long period of [noun sg] | 164 | |
4 | a long period [prep] [noun sg] | 154 | |
5 | a long period [prep] time | 115 | |
6 | a longer period [prep] [noun sg] | 18 |