SN4 ""

No	Pattern	Freq
1	[verb] once [coord] [adv]	111
2	[noun] once [coord] [adv]	100
3	[adv] once [coord] [adv]	92
4	[adv] once [coord] [adv]	64
5	[noun sg] once [coord] [adv]	64
6	[pron] once [coord] [adv]	45
7	[pers pn] once [coord] [adv]	43
8	[conj] once [coord] [adv]	35
9	[prep] once [coord] [adv]	33
10	[prep] once [coord] [adv]	33
11	[vb pp] once [coord] [adv]	29
12	[vb past] once [coord] [adv]	23
13	[vb base] once [coord] [adv]	22
14	at once [coord] [adv]	21
15	at once [coord] [adv]	21
16	only once [coord] [adv]	20
17	[noun pl] once [coord] [adv]	20
18	only once [coord] [adv]	20
19	[coord] once [coord] [adv]	18
20	[v-ing] once [coord] [adv]	17
21	[adj] once [coord] [adv]	15
22	it once [coord] [adv]	15
23	it once [coord] [adv]	15
24	and once [coord] [adv]	14
25	and once [coord] [adv]	14
26	not once [coord] [adv]	14
27	not once [coord] [adv]	14
28	[subord] once [coord] [adv]	14
29	[not/n't] once [coord] [adv]	14
30	[adv prt] once [coord] [adv]	13