SN4 ""

No	Pattern	Freq
1	over [adj] a [adj] period	8
2	over such a [adj] period	8
3	over such a [adj] period	8
4	over [det] a [adj] period	8
5	[noun] over a [adj] period	289
6	[noun sg] over a [adj] period	172
7	[noun pl] over a [adj] period	98
8	[verb] over a [adj] period	86
9	[vb pp] over a [adj] period	83
10	[adv] over a [adj] period	43
11	[adv] over a [adj] period	29
12	[adj] over a [adj] period	27
13	[conj] over a [adj] period	17
14	[adv prt] over a [adj] period	14
15	[adj] over a [adj] period	13
16	[coord] over a [adj] period	11
17	[n mass] over a [adj] period	10
18	[num] over a [adj] period	9
19	[noun prp] over a [adj] period	9
20	out over a [adj] period	6
21	that over a [adj] period	6
22	million over a [adj] period	6
23	out over a [adj] period	6
24	[that] over a [adj] period	6
25	[pron] over a [adj] period	6
26	million over a [adj] period	6
27	that over a [adj] period	6
28	or over a [adj] period	6
29	or over a [adj] period	6
30	time over a [adj] period	5