SN4 ""

No	Pattern	Freq
1	a [noun] [noun sg] at the [noun sg]	493
2	a [noun sg] [noun] at the [noun sg]	460
3	a [noun] [noun] at the end	62
4	a [noun] [noun] at the time	34
5	a [noun] [noun] at the university	26
6	a [noun prp] [noun] at the [noun sg]	25
7	a [noun] [noun] at the age	23
8	a [noun] [noun] at the back	19
9	a [noun] [noun] at the weekend	15
10	a [noun] [noun] at the moment	15
11	a [noun] attack at the [noun sg]	13
12	a [noun] attack at the [noun sg]	13
13	a heart [noun] at the [noun sg]	12
14	a heart [noun] at the [noun sg]	12
15	a [noun] [noun] at the start	10
16	a [noun] [noun] at the beginning	10
17	a [n mass] [noun] at the [noun sg]	10
18	a [noun] [noun] at the top	9
19	a [noun] [noun] at the bottom	9
20	a [noun] centre at the [noun sg]	7
21	a [noun] [noun] at the foot	7
22	a [noun] centre at the [noun sg]	7
23	a [noun] [noun] at the base	7
24	a [noun] [noun] at the home	7
25	a [noun] [noun] at the rear	7
26	a research [noun] at the [noun sg]	7
27	a research [noun] at the [noun sg]	7
28	a [noun] [noun] at the front	7
29	a [noun] match at the [noun sg]	6
30	a [noun] course at the [noun sg]	6