SN4 ""

No	Pattern	Freq
1	[to-vb] at a [adj] [noun sg]	316
2	[to-vb] at a [adj] [noun sg]	258
3	[to-vb] at a [adj] [noun sg]	235
4	[to-vb] at an [adj] [noun sg]	81
5	[to-vb] at a [adj -er] [noun sg]	53
6	to arrive at a [adj] [noun sg]	48
7	[to-vb] at a [adj] rate	31
8	to look at a [adj] [noun sg]	30
9	[to-vb] at a [adj] level	29
10	[to-vb] at a [adj] date	22
11	[to-vb] at a early [noun sg]	20
12	[to-vb] at a [adj] stage	19
13	[to-vb] at a later [noun sg]	18
14	[to-vb] at a late [noun sg]	18
15	[to-vb] at a high [noun sg]	17
16	to work at a [adj] [noun sg]	17
17	[to-vb] at a early [noun sg]	14
18	[to-vb] at a higher [noun sg]	13
19	[to-vb] at a [adj] time	10
20	[to-vb] at a [adj] price	10
21	[to-vb] at a particular [noun sg]	9
22	[to-vb] at a particular [noun sg]	9
23	[to-vb] at a [adj] speed	8
24	[to-vb] at a certain [noun sg]	7
25	[to-vb] at a certain [noun sg]	7
26	[to-vb] at a low [noun sg]	7
27	[to-vb] at a earlier [noun sg]	6
28	[to-vb] at a new [noun sg]	6
29	[to-vb] at a [adj] age	6
30	to start at a [adj] [noun sg]	6