SN4 ""

No	Pattern	Freq
1	the [num] years	1244
2	a [num] years	714
3	[art] hundred years	480
4	every [num] years	472
5	[art] two years	233
6	[art] five years	233
7	[art] three years	230
8	[art] thousand years	140
9	[art] four years	122
10	[art] ten years	103
11	[art] seven years	86
12	[art] million years	77
13	[art] thirty years	62
14	[art] dozen years	55
15	[art] six years	50
16	[art] twenty years	35
17	[art] 20 years	34
18	[art] 10 years	32
19	[art] eight years	32
20	[art] 30 years	21
21	[art] fifty years	18
22	[art] nine years	17
23	[art] twelve years	16
24	[art] fifteen years	14
25	[art] billion years	14
26	[art] 3 years	13
27	[art] forty years	13
28	[art] thirteen years	13
29	[art] 5 years	12
30	[art] twenty-five years	11