SN4 ""

No	Pattern	Freq
1	at [adv] [art] [noun]	1554
2	at [adv] [art] [noun sg]	1380
3	at least [art] [noun]	1198
4	at [adv] the [noun]	755
5	at [adv] a [noun]	650
6	at [adv] [art] [noun pl]	113
7	at once [art] [noun]	113
8	at [adv] an [noun]	94
9	at [adv] [art] year	75
10	at [adv] [art] year	75
11	at [adv] [art] week	44
12	at [adv] every [noun]	44
13	at [adv] [art] week	44
14	at [adv] [art] hour	43
15	at [adv] [art] hour	43
16	at [adv] [art] month	38
17	at [adv] [art] month	38
18	at [adv] [art] quarter	36
19	at [adv] [art] quarter	36
20	at both [art] [noun]	35
21	at [adv] [art] [noun prp]	33
22	at [adv] [art] couple	33
23	at [adv] [art] couple	33
24	at [adv] [art] time	32
25	at [adv] [art] time	32
26	at [adv] [art] [n mass]	28
27	at precisely [art] [noun]	27
28	at [adv] [art] decade	23
29	at [adv] [art] decade	23
30	at twice [art] [noun]	23