SN4 ""

No	Pattern	Freq
1	[verb] at a [adj] [noun] and	116
2	[verb] at a [adj] [noun sg] and	114
3	[verb] at a [adj] [noun] and	107
4	[verb] at a [adj] [noun] and	92
5	[vb pp] at a [adj] [noun] and	46
6	[verb] at an [adj] [noun] and	24
7	[v-ing] at a [adj] [noun] and	18
8	[vb past] at a [adj] [noun] and	17
9	[verb] at a [adj] rate and	13
10	[verb] at a [adj] rate and	13
11	[to-vb] at a [adj] [noun] and	12
12	[verb] at a [adj] pace and	11
13	[verb] at a [adj] pace and	11
14	[verb] at a [adj] level and	10
15	[verb] at a [adj] level and	10
16	[vb infin] at a [adj] [noun] and	9
17	[verb] at a early [noun] and	9
18	[vb -s] at a [adj] [noun] and	9
19	look at a [adj] [noun] and	9
20	[verb] at a particular [noun] and	8
21	[verb] at a particular [noun] and	8
22	[verb] at a early [noun] and	8
23	[verb] at a [adj -er] [noun] and	7
24	[verb] at a [adj] speed and	6
25	[verb] at a [adj] speed and	6
26	[verb] at a [adj] date and	6
27	[verb] at a [adj] date and	6
28	[verb] at a different [noun] and	5
29	[verb] at a [adj] time and	5
30	[verb] at a high [noun] and	5