SN4 ""

No	Pattern	Freq
1	at the [noun sg]	95376
2	at the end	10593
3	at the time	8151
4	at the moment	5111
5	at the beginning	2847
6	at the top	2643
7	at the back	2259
8	at the bottom	1700
9	at the age	1470
10	at the start	1342
11	at the centre	1191
12	at the university	1111
13	at the expense	1100
14	at the door	1015
15	at the heart	904
16	at the front	770
17	at the weekend	708
18	at the level	611
19	at the foot	608
20	at the table	545
21	at the outset	534
22	at the head	533
23	at the side	488
24	at the point	477
25	at the base	456
26	at the school	452
27	at the house	427
28	at the thought	418
29	at the edge	409
30	at the hospital	403