SN4 ""

No	Pattern	Freq
1	two years	7360
2	three years	5388
3	five years	4844
4	ten years	3202
5	four years	2965
6	twenty years	1846
7	20 years	1643
8	six years	1642
9	10 years	1545
10	seven years	1462
11	hundred years	1186
12	thirty years	1090
13	30 years	1053
14	eight years	1012
15	25 years	760
16	fifty years	752
17	15 years	731
18	40 years	714
19	fifteen years	689
20	forty years	657
21	50 years	594
22	million years	571
23	nine years	557
24	12 years	519
25	thousand years	428
26	twelve years	405
27	100 years	371
28	13 years	354
29	twenty-five years	329
30	5 years	304