SN4 ""

No	Pattern	Freq
1	[vb pp] at a [adj -er]	222
2	[verb] at a later	151
3	[verb] at a higher	63
4	[verb] at a lower	58
5	[v-ing] at a [adj -er]	49
6	[to-vb] at a [adj -er]	46
7	come at a [adj -er]	32
8	[vb -s] at a [adj -er]	29
9	[verb] at a faster	29
10	[vb infin] at a [adj -er]	27
11	come at a [adj -er]	24
12	[verb] at a better	19
13	[vb base] at a [adj -er]	19
14	[verb] at a worse	17
15	[verb] at a slower	15
16	[vb past] at a [adj -er]	13
17	occur at a [adj -er]	9
18	[verb] at a further	9
19	aim at a [adj -er]	9
20	grow at a [adj -er]	8
21	arrive at a [adj -er]	8
22	[verb] at a greater	8
23	operate at a [adj -er]	8
24	work at a [adj -er]	8
25	increase at a [adj -er]	7
26	take at a [adj -er]	6
27	add at a [adj -er]	6
28	aimed at a [adj -er]	6
29	[verb] at a wider	6
30	added at a [adj -er]	6