SN4 ""

No	Pattern	Freq
1	[adj] [prep] three years	146
2	[adj] [prep] three years	146
3	[num] [prep] three years	102
4	[adj] to three years	86
5	[adj] to three years	86
6	two [prep] three years	77
7	two [prep] three years	77
8	[adj] [prep] three years	31
9	[adj] for three years	28
10	[adj] for three years	28
11	[adj] in three years	14
12	[adj] in three years	14
13	[det] [prep] three years	7
14	[adj] within three years	5
15	[adj] past three years	5
16	these [prep] three years	5
17	[adj] within three years	5
18	these [prep] three years	5
19	[adj] past three years	5