SN4 ""

No	Pattern	Freq
1	at the [adj -est] [noun] [prep]	228
2	at the [adj -est] [noun sg] [prep]	193
3	at the [adj -est] [noun] of	124
4	at the [adj -est] [noun] of	124
5	at the [adj -est] level [prep]	65
6	at the highest [noun] [prep]	65
7	at the [adj -est] level [prep]	49
8	at the [adj -est] [noun] in	47
9	at the [adj -est] [noun] in	47
10	at the lowest [noun] [prep]	41
11	at the [adj -est] [noun pl] [prep]	35
12	at the [adj -est] point [prep]	29
13	at the [adj -est] point [prep]	29
14	at the [adj -est] end [prep]	17
15	at the [adj -est] levels [prep]	16
16	at the [adj -est] end [prep]	16
17	at the latest [noun] [prep]	15
18	at the best [noun] [prep]	15
19	at the slightest [noun] [prep]	13
20	at the [adj -est] [noun] on	12
21	at the [adj -est] [noun] for	12
22	at the [adj -est] [noun] for	12
23	at the [adj -est] [noun] on	12
24	at the earliest [noun] [prep]	11
25	at the [adj -est] rate [prep]	8
26	at the nearest [noun] [prep]	7
27	at the [adj -est] sign [prep]	7
28	at the [adj -est] opportunity [prep]	7
29	at the [adj -est] part [prep]	7
30	at the [adj -est] sign [prep]	7