SN4 ""

No	Pattern	Freq
1	[noun] over a [adj] [noun] period	76
2	[noun] over a [adj] [noun sg] period	76
3	[noun] over a [adj] year period	43
4	[noun] over a [adj] year period	43
5	[noun] over a [adj] month period	10
6	[noun] over a [adj] month period	10
7	[noun] over a [adj] [adj] period	9
8	[noun] over a [adj] [adj] period	9
9	[noun] over a [adj] day period	6
10	[noun] over a [adj] day period	6
11	[noun] over a [adj] minute period	5
12	[noun] over a [adj] time period	5
13	[noun] over a [adj] hour period	5
14	[noun] over a [adj] week period	5
15	[noun] over a [adj] minute period	5
16	[noun] over a [adj] hour period	5
17	[noun] over a [adj] week period	5
18	[noun] over a [adj] time period	5
19	[adj] [noun] over a [adj] period	114
20	[adj] [noun] over a [adj] period	86
21	[prep] [noun] over a [adj] period	58
22	[prep] [noun] over a [adj] period	58
23	[noun] [noun] over a [adj] period	43
24	[noun sg] [noun] over a [adj] period	38
25	of [noun] over a [adj] period	35
26	of [noun] over a [adj] period	35
27	[art] [noun] over a [adj] period	29
28	[art] [noun] over a [adj] period	29
29	the [noun] over a [adj] period	24
30	the [noun] over a [adj] period	24