SN4 ""

No	Pattern	Freq
1	a [noun sg] at the [noun sg]	2814
2	a [noun sg] at the [noun sg]	2549
3	a [noun sg] at the end	276
4	an [noun sg] at the [noun sg]	265
5	a look at the [noun sg]	245
6	a [noun sg] at the back	123
7	a [noun sg] at the time	119
8	a [noun sg] at the door	90
9	a [noun sg] at the moment	89
10	a [noun sg] at the top	77
11	a [noun sg] at the university	69
12	a [noun sg] at the bottom	61
13	a glance at the [noun sg]	55
14	a knock at the [noun sg]	50
15	a [noun sg] at the beginning	46
16	a [noun sg] at the centre	42
17	a place at the [noun sg]	34
18	a [noun sg] at the side	34
19	a [noun sg] at the front	33
20	a day at the [noun sg]	30
21	a door at the [noun sg]	29
22	a [noun sg] at the heart	24
23	a student at the [noun sg]	24
24	a [noun sg] at the hospital	23
25	a [noun sg] at the age	23
26	a tap at the [noun sg]	21
27	a [noun sg] at the foot	21
28	a job at the [noun sg]	21
29	a [noun sg] at the start	20
30	a go at the [noun sg]	20