SN4 ""

No	Pattern	Freq
1	a [det] at a time	10
2	[art] [det] at a time	10
3	a [det] at a time	10
4	[art] [det] at a time	10
5	[conj] [det] at a time	9
6	[coord] [det] at a time	9
7	and [det] at a time	9
8	and [det] at a time	9
9	[verb] [det] at a time	5
10	[prep] [det] at a time	5
11	[prep] [det] at a time	5
12	[det] [noun] at a time	95
13	[det] [noun pl] at a time	74
14	[det] [noun sg] at a time	21
15	[det] be at a time	18
16	[det] [be] at a time	18
17	[det] [was/were] at a time	14
18	[det] was at a time	14
19	[det] [verb] at a time	13
20	[det] week at a time	12
21	[det] weeks at a time	12
22	[det] day at a time	10
23	[det] days at a time	9
24	[det] [adj] at a time	9
25	[det] minutes at a time	8
26	[det] minute at a time	8
27	[det] month at a time	7
28	[det] [vb past] at a time	7
29	[det] months at a time	7
30	[det] come at a time	7