SN4 ""

No	Pattern	Freq
1	[verb] at a [adj] level	271
2	[verb] at a [adj] level	244
3	[verb] at a [adj] level	217
4	[vb pp] at a [adj] level	123
5	[verb] at a high level	72
6	[verb] at a [adj -er] level	54
7	[verb] at a high level	42
8	[v-ing] at a [adj] level	41
9	[verb] at a low level	36
10	[verb] at a higher level	30
11	[to-vb] at a [adj] level	29
12	[verb] at an [adj] level	27
13	[vb past] at a [adj] level	22
14	[vb -s] at a [adj] level	21
15	[vb base] at a [adj] level	20
16	[verb] at a lower level	19
17	[verb] at a low level	17
18	work at a [adj] level	16
19	remain at a [adj] level	16
20	[vb infin] at a [adj] level	15
21	continue at a [adj] level	15
22	[verb] at a local level	13
23	[verb] at a local level	13
24	operate at a [adj] level	10
25	[verb] at a reasonable level	9
26	[verb] at a reasonable level	9
27	run at a [adj] level	8
28	keep at a [adj] level	7
29	working at a [adj] level	7
30	kept at a [adj] level	7