SN4 ""

No	Pattern	Freq
1	[prep] once [prep]	348
2	[prep] once [prep]	348
3	at once [prep]	278
4	at once [prep]	278
5	[adv] once [prep]	256
6	[verb] once [prep]	249
7	[adv] once [prep]	220
8	[conj] once [prep]	204
9	[noun] once [prep]	164
10	[noun sg] once [prep]	110
11	[vb pp] once [prep]	107
12	[coord] once [prep]	97
13	[subord] once [prep]	86
14	[pron] once [prep]	78
15	than once [prep]	78
16	than once [prep]	78
17	only once [prep]	77
18	only once [prep]	77
19	and once [prep]	71
20	and once [prep]	71
21	[vb past] once [prep]	70
22	[pers pn] once [prep]	68
23	[be] once [prep]	59
24	be once [prep]	59
25	for once [prep]	58
26	for once [prep]	58
27	least once [prep]	53
28	least once [prep]	53
29	[was/were] once [prep]	52
30	was once [prep]	39