SN4 ""

No	Pattern	Freq
1	[noun] once [adv]	1253
2	[verb] once [adv]	1074
3	[noun sg] once [adv]	803
4	[be] once [adv]	575
5	be once [adv]	574
6	[conj] once [adv]	525
7	[vb past] once [adv]	398
8	[adv] once [adv]	393
9	[pron] once [adv]	390
10	[coord] once [adv]	385
11	[was/were] once [adv]	362
12	[pers pn] once [adv]	309
13	and once [adv]	272
14	and once [adv]	272
15	was once [adv]	245
16	[adv] once [adv]	244
17	[noun prp] once [adv]	224
18	[noun pl] once [adv]	209
19	[vb pp] once [adv]	208
20	[adj] once [adv]	186
21	[is] once [adv]	145
22	[adv prt] once [adv]	142
23	is once [adv]	141
24	[vb mod] once [adv]	139
25	have once [adv]	139
26	[modal v] once [adv]	139
27	[adj] once [adv]	131
28	[prep] once [adv]	127
29	[prep] once [adv]	127
30	were once [adv]	116