SN4 ""

No	Pattern	Freq
1	at [adj] [noun pl] in [art]	349
2	at [adj] [noun pl] in the	298
3	at [adj] [noun pl] in [art]	216
4	at [det] [noun pl] in [art]	83
5	at [adj] points in [art]	62
6	at [adj] levels in [art]	43
7	at all [noun pl] in [art]	43
8	at all [noun pl] in [art]	43
9	at [adj] [noun pl] in a	42
10	at different [noun pl] in [art]	40
11	at different [noun pl] in [art]	40
12	at [adj] times in [art]	35
13	at [num] [noun pl] in [art]	35
14	at various [noun pl] in [art]	32
15	at various [noun pl] in [art]	32
16	at [adj] stages in [art]	29
17	at certain [noun pl] in [art]	18
18	at certain [noun pl] in [art]	18
19	at other [noun pl] in [art]	17
20	at [adj] sites in [art]	17
21	at other [noun pl] in [art]	17
22	at [adj -er] [noun pl] in [art]	14
23	at several [noun pl] in [art]	12
24	at several [noun pl] in [art]	12
25	at [adj] places in [art]	11
26	at these [noun pl] in [art]	9
27	at these [noun pl] in [art]	9
28	at low [noun pl] in [art]	8
29	at two [noun pl] in [art]	7
30	at [adj] [noun pl] in an	7