SN4 ""

No	Pattern	Freq
1	[noun] over a [adj] [noun sg] period	76
2	[noun] over a [num] [noun] period	69
3	[noun] over a [adj] year period	43
4	[noun] over a [adj] year period	43
5	[noun sg] over a [adj] [noun] period	36
6	[noun pl] over a [adj] [noun] period	34
7	[noun] over a three [noun] period	14
8	[noun] over a three [noun] period	14
9	[noun] over a [adj] month period	10
10	[noun] over a [adj] month period	10
11	[noun] over a five [noun] period	8
12	[noun] over a five [noun] period	8
13	[noun] over a six [noun] period	8
14	[noun] over a six [noun] period	8
15	[noun] over a two [noun] period	7
16	[noun] over a two [noun] period	7
17	[noun] over a [adj] day period	6
18	[noun] over a [adj] day period	6
19	[noun] over a [adj] hour period	5
20	[noun] over a [adj] hour period	5
21	[noun] over a [adj] week period	5
22	[noun] over a [adj] week period	5
23	[noun] over a [adj] [noun] period	5
24	[noun] over a [adj] time period	5
25	[noun] over a [adj] time period	5