SN4 ""

No	Pattern	Freq
1	at [adv] [num] month	237
2	at [adv] [adj] months	217
3	at least [adj] month	215
4	at [adv] six month	73
5	at [adv] six month	73
6	at [adv] three month	40
7	at [adv] three month	40
8	at [adv] two month	25
9	at [adv] two month	25
10	at [adv] [adj] month	24
11	at [adv] one month	16
12	at [adv] one month	16
13	at [adv] 18 month	14
14	at [adv] 18 month	14
15	at about [adj] month	10
16	at [adv] 12 month	9
17	at [adv] nine month	9
18	at [adv] 12 month	9
19	at [adv] nine month	9
20	at [adv] twelve month	8
21	at [adv] twelve month	8
22	at around [adj] month	6
23	at [adv] four month	6
24	at [adv] four month	6
25	at [adv] eighteen month	5
26	at [adv] eighteen month	5
27	at [adv] five month	5
28	at [adv] five month	5