SN4 ""

No	Pattern	Freq
1	[verb] at a [adj] [noun sg] in	228
2	[verb] at a [adj] [noun] in	200
3	[verb] at a [adj] [noun] in	182
4	[vb pp] at a [adj] [noun] in	125
5	[verb] at an [adj] [noun] in	49
6	[vb past] at a [adj] [noun] in	32
7	[verb] at a [adj -er] [noun] in	29
8	[v-ing] at a [adj] [noun] in	28
9	[verb] at a [adj] stage in	24
10	[verb] at a [adj] stage in	24
11	[verb] at a early [noun] in	21
12	[verb] at a [adj] level in	17
13	[verb] at a [adj] level in	17
14	[verb] at a [adj] rate in	16
15	[to-vb] at a [adj] [noun] in	16
16	[verb] at a [adj] rate in	16
17	[vb -s] at a [adj] [noun] in	15
18	[verb] at a [adj] meeting in	14
19	[verb] at a [adj] point in	14
20	[verb] at a [adj] meeting in	14
21	[verb] at a [adj] point in	14
22	[verb] at a earlier [noun] in	11
23	[verb] at a late [noun] in	10
24	[verb] at a early [noun] in	10
25	[verb] at a later [noun] in	9
26	[verb] at a [adj] conference in	9
27	[verb] at a particular [noun] in	9
28	[verb] at a particular [noun] in	9
29	[verb] at a [adj] conference in	9
30	[verb] at a special [noun] in	9