SN4 ""

No	Pattern	Freq
1	about [num] years	1267
2	about [adj] years	1267
3	about two years	160
4	about two years	160
5	about ten years	123
6	about ten years	123
7	about three years	116
8	about three years	116
9	about five years	93
10	about five years	93
11	about four years	79
12	about four years	79
13	about twenty years	46
14	about twenty years	46
15	about seven years	44
16	about seven years	44
17	about six years	40
18	about six years	40
19	about 20 years	34
20	about 20 years	34
21	about eight years	33
22	about eight years	33
23	about thirty years	32
24	about thirty years	32
25	about 10 years	30
26	about 10 years	30
27	about fifteen years	30
28	about fifteen years	30
29	about 15 years	26
30	about 15 years	26