SN4 ""

No	Pattern	Freq
1	[noun] [noun pl] at the [noun sg]	1045
2	[noun sg] [noun pl] at the [noun sg]	886
3	[noun] [noun pl] at the end	114
4	[noun prp] [noun pl] at the [noun sg]	91
5	[noun] [noun pl] at the time	78
6	[noun pl] [noun pl] at the [noun sg]	41
7	[noun] [noun pl] at the university	41
8	[noun] [noun pl] at the moment	40
9	[noun] [noun pl] at the beginning	29
10	[noun] [noun pl] at the expense	23
11	[noun] [noun pl] at the back	23
12	[noun] services at the [noun sg]	22
13	[noun] [noun pl] at the top	21
14	[n mass] [noun pl] at the [noun sg]	19
15	[noun] [noun pl] at the start	18
16	[noun] levels at the [noun sg]	17
17	[noun] [noun pl] at the centre	14
18	[noun] [noun pl] at the weekend	14
19	[noun] [noun pl] at the school	12
20	[noun] [noun pl] at the age	12
21	security [noun pl] at the [noun sg]	12
22	[noun] workers at the [noun sg]	12
23	security [noun pl] at the [noun sg]	12
24	[noun] [noun pl] at the level	11
25	[noun] students at the [noun sg]	11
26	[noun] [noun pl] at the bottom	11
27	[noun] studies at the [noun sg]	11
28	[noun] officers at the [noun sg]	11
29	[noun] members at the [noun sg]	11
30	[noun] [noun pl] at the front	11