SN4 ""

No	Pattern	Freq
1	[conj] at a [adj] [noun sg]	300
2	[coord] at a [adj] [noun]	208
3	[conj] at a [adj] [noun]	208
4	and at a [adj] [noun]	100
5	and at a [adj] [noun]	100
6	[conj] at a [adj -er] [noun]	94
7	[subord] at a [adj] [noun]	77
8	but at a [adj] [noun]	60
9	but at a [adj] [noun]	60
10	or at a [adj] [noun]	48
11	or at a [adj] [noun]	48
12	[conj] at a [adj] level	39
13	[conj] at a [adj] level	39
14	[conj] at a later [noun]	35
15	[conj] at a late [noun]	35
16	[conj] at a [adj] rate	34
17	[conj] at a [adj] rate	34
18	[conj] at a low [noun]	23
19	that at a [adj] [noun]	21
20	[that] at a [adj] [noun]	21
21	that at a [adj] [noun]	21
22	[conj] at a [adj] time	21
23	[conj] at a [adj] time	21
24	[conj] at a lower [noun]	19
25	[conj] at a slow [noun]	18
26	[conj] at a [adj] cost	18
27	[conj] at a [adj] cost	18
28	[conj] at a [adj] meeting	17
29	[conj] at a slower [noun]	17
30	[conj] at a [adj] date	17