SN4 ""

No	Pattern	Freq
1	once [coord] [adv] [adv]	40
2	once [coord] [adv] [adv]	37
3	once [coord] twice [adv]	25
4	once [coord] twice [adv]	25
5	once [coord] [verb] [adv]	23
6	once [coord] [vb past] [adv]	12
7	once [coord] [vb base] [adv]	7
8	[verb] once [coord] [adv]	111
9	[noun] once [coord] [adv]	100
10	[adv] once [coord] [adv]	92
11	[adv] once [coord] [adv]	64
12	[noun sg] once [coord] [adv]	64
13	[pron] once [coord] [adv]	45
14	[pers pn] once [coord] [adv]	43
15	[conj] once [coord] [adv]	35
16	[prep] once [coord] [adv]	33
17	[prep] once [coord] [adv]	33
18	[vb pp] once [coord] [adv]	29
19	[vb past] once [coord] [adv]	23
20	[vb base] once [coord] [adv]	22
21	at once [coord] [adv]	21
22	at once [coord] [adv]	21
23	only once [coord] [adv]	20
24	[noun pl] once [coord] [adv]	20
25	only once [coord] [adv]	20
26	[coord] once [coord] [adv]	18
27	[v-ing] once [coord] [adv]	17
28	[adj] once [coord] [adv]	15
29	it once [coord] [adv]	15
30	it once [coord] [adv]	15