SN4 ""

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