SN4 ""

No	Pattern	Freq
1	once [prep] a	498
2	once [prep] a	498
3	once [prep] a	474
4	once in a	205
5	once in a	205
6	once upon a	163
7	once upon a	163
8	once [prep] an	24
9	once as a	20
10	once as a	20
11	once on a	19
12	once on a	19
13	once with a	17
14	once with a	17
15	once by a	15
16	once by a	15
17	once to a	10
18	once to a	10
19	once at a	7
20	once for a	7
21	once for a	7
22	once into a	7
23	once into a	7
24	once at a	7
25	once during a	5
26	once during a	5
27	once from a	5
28	once from a	5