SN4 ""

No	Pattern	Freq
1	at [num] [adv] [conj]	248
2	at [adj] [adv] [coord]	228
3	at [adj] [adv] and	201
4	at [adj] [adv] and	201
5	at [adj] o'clock [conj]	98
6	at [adj] [adv] [subord]	55
7	at [adj] p.m. [conj]	44
8	at [adj] am [conj]	34
9	at [det] [adv] [conj]	32
10	at [adj] a.m. [conj]	29
11	at [adj] pm [conj]	21
12	at all [adv] [conj]	20
13	at all [adv] [conj]	20
14	at eight [adv] [conj]	16
15	at eight [adv] [conj]	16
16	at [adj] [adv] or	15
17	at four [adv] [conj]	15
18	at [adj] [adv] or	15
19	at four [adv] [conj]	15
20	at [adj] [adv] if	14
21	at [adj] [adv] if	14
22	at six [adv] [conj]	13
23	at six [adv] [conj]	13
24	at [adj] [adv] than	12
25	at [adj] [adv] than	12
26	at ten [adv] [conj]	11
27	at ten [adv] [conj]	11
28	at 7.30 [adv] [conj]	10
29	at [adj] [adv] but	10
30	at [adj] [adv] but	10