SN4 ""

No	Pattern	Freq
1	[verb] at a [adj] [noun sg] and	106
2	[verb] at a [adj] [noun sg] and	90
3	[vb pp] at a [adj] [noun sg] and	46
4	[verb] at an [adj] [noun sg] and	24
5	[v-ing] at a [adj] [noun sg] and	17
6	[vb past] at a [adj] [noun sg] and	16
7	[verb] at a [adj] rate and	13
8	[to-vb] at a [adj] [noun sg] and	12
9	[verb] at a [adj] pace and	11
10	[verb] at a [adj] level and	10
11	look at a [adj] [noun sg] and	9
12	[vb -s] at a [adj] [noun sg] and	9
13	[vb infin] at a [adj] [noun sg] and	9
14	[verb] at a early [noun sg] and	9
15	[verb] at a particular [noun sg] and	8
16	[verb] at a early [noun sg] and	8
17	[verb] at a particular [noun sg] and	8
18	[verb] at a [adj -er] [noun sg] and	7
19	[verb] at a [adj] date and	6
20	[verb] at a [adj] speed and	6
21	[vb base] at a [adj] [noun sg] and	5
22	[verb] at a [adj] time and	5
23	[verb] at a high [noun sg] and	5
24	[verb] at a different [noun sg] and	5
25	[verb] at a different [noun sg] and	5
26	[verb] at a [adj] age and	5
27	work at a [adj] [noun sg] and	5