SN4 ""

No	Pattern	Freq
1	[verb] once [conj] for	78
2	[noun] once [conj] for	76
3	[noun sg] once [conj] for	56
4	[vb pp] once [conj] for	27
5	[adv] once [conj] for	26
6	[adv prt] once [conj] for	21
7	[to-vb] once [conj] for	19
8	[noun pl] once [conj] for	17
9	[pron] once [conj] for	14
10	[pers pn] once [conj] for	13
11	a once [conj] for	12
12	[prep] once [conj] for	12
13	[art] once [conj] for	12
14	a once [conj] for	12
15	[art] once [conj] for	12
16	[prep] once [conj] for	12
17	out once [conj] for	11
18	out once [conj] for	11
19	[vb infin] once [conj] for	9
20	[vb past] once [conj] for	8
21	[vb base] once [conj] for	7
22	problem once [conj] for	7
23	[adj] once [conj] for	7
24	it once [conj] for	6
25	it once [conj] for	6
26	[v-ing] once [conj] for	5
27	[adv] once [conj] for	5
28	problem once [conj] for	5
29	once [conj] for [adj]	276
30	once [conj] for all	274