SN4 ""

No	Pattern	Freq
1	[noun] over a [adj] period	307
2	[noun sg] over a [adj] period	181
3	[noun pl] over a [adj] period	105
4	[verb] over a [adj] period	88
5	[vb pp] over a [adj] period	84
6	[adv] over a [adj] period	44
7	[adv] over a [adj] period	29
8	[adj] over a [adj] period	28
9	[conj] over a [adj] period	17
10	[adv prt] over a [adj] period	15
11	[adj] over a [adj] period	14
12	[n mass] over a [adj] period	11
13	[coord] over a [adj] period	11
14	[noun prp] over a [adj] period	10
15	[num] over a [adj] period	9
16	out over a [adj] period	7
17	out over a [adj] period	7
18	that over a [adj] period	6
19	or over a [adj] period	6
20	million over a [adj] period	6
21	[pron] over a [adj] period	6
22	that over a [adj] period	6
23	or over a [adj] period	6
24	[that] over a [adj] period	6
25	million over a [adj] period	6
26	in over a [adj] period	5
27	in over a [adj] period	5
28	money over a [adj] period	5
29	money over a [adj] period	5
30	[no cls] over a [adj] period	5