SN4 ""

No	Pattern	Freq
1	[noun] occur at a	50
2	[noun sg] occur at a	34
3	[verb] occur at a	15
4	[noun pl] occur at a	13
5	[pron] occur at a	10
6	[adj] occur at a	9
7	have occur at a	9
8	[adv] occur at a	8
9	[vb mod] occur at a	7
10	[det] occur at a	7
11	[modal v] occur at a	7
12	[be] occur at a	6
13	be occur at a	6
14	this occur at a	6
15	this occur at a	6
16	[conj] occur at a	6
17	[vb past] occur at a	5
18	[pers pn] occur at a	5
19	which occur at a	5
20	which occur at a	5
21	[adv] occur at a	5
22	[Wh det] occur at a	5
23	occur at a [noun]	59
24	occur at a [noun sg]	58
25	occur at a [adj]	48
26	occur at a [adj]	36
27	occur at a time	18
28	occur at a time	18
29	occur at a [adj -er]	12
30	occur at a [adv]	9