SN4 ""

No	Pattern	Freq
1	at the [adj] [noun sg] for	244
2	at the [adj] [noun] for	227
3	at the [adj] [noun pl] for	43
4	at the [adj] time for	37
5	at the [adj] time for	37
6	at the same [noun] for	35
7	at the same [noun] for	35
8	at the [det] [noun] for	35
9	at the right [noun] for	22
10	at the national [noun] for	22
11	at the right [noun] for	22
12	at the national [noun] for	22
13	at the [adj] centre for	13
14	at the [adj] centre for	13
15	at the [adj] level for	12
16	at the [adj -est] [noun] for	12
17	at the [adj] level for	12
18	at the [adj] rate for	11
19	at the [adj] institute for	10
20	at the [adj] rate for	10
21	at the [adj] institute for	10
22	at the [adj] hospital for	9
23	at the international [noun] for	9
24	at the [num ord] [noun] for	9
25	at the [adj] hospital for	9
26	at the international [noun] for	9
27	at the royal [noun] for	7
28	at the [adj] school for	7
29	at the royal [noun] for	7
30	at the [adj] school for	7