SN4 ""

No	Pattern	Freq
1	at [adj] level	757
2	at [adj] levels	414
3	at local level	174
4	at different level	118
5	at national level	115
6	at low level	56
7	at international level	54
8	at various level	51
9	at secondary level	45
10	at high level	38
11	at federal level	28
12	at senior level	28
13	at primary level	28
14	at current level	20
15	at regional level	19
16	at ministerial level	18
17	at top level	17
18	at other level	15
19	at advanced level	14
20	at ambassadorial level	13
21	at intermediate level	12
22	at varying level	10
23	at present level	9
24	at similar level	9
25	at european level	9
26	at central level	8
27	at ground-floor level	8
28	at appropriate level	7
29	at normal level	6
30	at certain level	6