SN4 ""

No	Pattern	Freq
1	[noun] at a [adj -er] [noun sg]	382
2	[noun sg] at a [adj -er] [noun]	270
3	[noun] at a later [noun]	208
4	[noun] at a [adj -er] date	118
5	[noun] at a [adj -er] date	118
6	[noun pl] at a [adj -er] [noun]	95
7	[noun] at a [adj -er] stage	61
8	[noun] at a [adj -er] stage	61
9	[noun] at a lower [noun]	58
10	[noun] at a higher [noun]	56
11	[noun] at a [adj -er] level	46
12	[noun] at a [adj -er] level	46
13	[noun] at a [adj -er] rate	44
14	[noun] at a [adj -er] rate	44
15	[noun] at a [adj -er] price	23
16	[noun] at a [adj -er] price	23
17	[noun] at a [adj -er] time	18
18	[noun] at a [adj -er] time	18
19	[noun] at a faster [noun]	15
20	[noun prp] at a [adj -er] [noun]	14
21	password at a [adj -er] [noun]	10
22	password at a [adj -er] [noun]	10
23	request at a [adj -er] [noun]	10
24	request at a [adj -er] [noun]	10
25	[noun] at a slower [noun]	9
26	[noun] at a [adj -er] cost	9
27	[noun] at a [adj -er] cost	9
28	[noun] at a [adj -er] age	8
29	[noun] at a [adj -er] age	8
30	[noun] at a further [noun]	8