SN4 ""

No	Pattern	Freq
1	[noun sg] over a [adj] period	172
2	[noun sg] over a [adj] period	165
3	[noun sg] over a long period	81
4	[noun sg] over a long period	66
5	[noun sg] over a [adj -er] period	16
6	[noun sg] over a longer period	15
7	[noun sg] over an [adj] period	9
8	[noun sg] over a four-year period	7
9	[noun sg] over a extended period	7
10	[noun sg] over a four-year period	7
11	[noun sg] over a extended period	7
12	[noun sg] over a five-year period	6
13	[noun sg] over a prolonged period	6
14	[noun sg] over a prolonged period	6
15	[noun sg] over a five-year period	6
16	[noun sg] over a three-year period	5
17	money over a [adj] period	5
18	[noun sg] over a lengthy period	5
19	[noun sg] over a lengthy period	5
20	[noun sg] over a three-year period	5
21	[noun sg] over a short period	5
22	[noun sg] over a short period	5