SN4 ""

No	Pattern	Freq
1	[prep] the [adj] three years	239
2	[prep] the [adj] three years	239
3	[prep] the past three years	176
4	over the [adj] three years	79
5	over the [adj] three years	79
6	in the [adj] three years	61
7	in the [adj] three years	61
8	for the [adj] three years	58
9	for the [adj] three years	58
10	[prep] the previous three years	35
11	of the [adj] three years	18
12	of the [adj] three years	18
13	during the [adj] three years	17
14	[prep] the following three years	17
15	during the [adj] three years	17