SN4 ""

No	Pattern	Freq
1	[noun] once it is	28
2	[noun sg] once it is	26
3	[conj] once it is	24
4	[coord] once it is	13
5	[verb] once it is	11
6	but once it is	7
7	but once it is	7
8	and once it is	6
9	[subord] once it is	6
10	and once it is	6
11	[that] once it is	5
12	that once it is	5
13	that once it is	5
14	[adj] once it is	5
15	once it is [verb]	92
16	once it is [vb pp]	87
17	once it is [adj]	14
18	once it is [adj]	13
19	once it is [adv]	13
20	once it is [prep]	10
21	once it is [prep]	10
22	once it is [adv]	9
23	once it is accept	8
24	once it is accepted	8
25	once it is establish	8
26	once it is established	8
27	once it is in	6
28	once it is in	6
29	once it is [v-ing]	5