SN4 ""

No	Pattern	Freq
1	at an [adj]	2107
2	at an early	482
3	at an annual	96
4	at an average	72
5	at an additional	56
6	at an appropriate	55
7	at an alarming	48
8	at an extraordinary	47
9	at an international	41
10	at an estimated	40
11	at an open	32
12	at an advanced	28
13	at an old	28
14	at an all-time	28
15	at an initial	25
16	at an agreed	23
17	at an informal	21
18	at an affordable	20
19	at an individual	18
20	at an official	18
21	at an increasing	18
22	at an unspecified	15
23	at an empty	15
24	at an important	14
25	at an acceptable	14
26	at an extra	13
27	at an unprecedented	12
28	at an increased	12
29	at an industrial	12
30	at an astonishing	10