SN4 ""

No	Pattern	Freq
1	[to-vb] at a [adj] [noun]	319
2	[to-vb] at a [adj] [noun sg]	316
3	[to-vb] at a [adj] [noun]	259
4	[to-vb] at a [adj] [noun]	238
5	[to-vb] at an [adj] [noun]	81
6	[to-vb] at a [adj -er] [noun]	53
7	to arrive at a [adj] [noun]	48
8	to look at a [adj] [noun]	33
9	[to-vb] at a [adj] rate	31
10	[to-vb] at a [adj] rate	31
11	[to-vb] at a [adj] level	29
12	[to-vb] at a [adj] level	29
13	[to-vb] at a [adj] date	22
14	[to-vb] at a [adj] date	22
15	[to-vb] at a early [noun]	20
16	[to-vb] at a [adj] stage	19
17	[to-vb] at a [adj] stage	19
18	[to-vb] at a late [noun]	18
19	[to-vb] at a later [noun]	18
20	to work at a [adj] [noun]	17
21	[to-vb] at a high [noun]	17
22	[to-vb] at a early [noun]	14
23	[to-vb] at a higher [noun]	13
24	[to-vb] at a [adj] time	10
25	[to-vb] at a [adj] price	10
26	[to-vb] at a [adj] price	10
27	[to-vb] at a [adj] time	10
28	[to-vb] at a particular [noun]	9
29	[to-vb] at a particular [noun]	9
30	[to-vb] at a [adj] speed	8