SN4 ""

No	Pattern	Freq
1	[prep] [det] [adj] period	252
2	[prep] this [adj] period	128
3	in [det] [adj] period	83
4	[prep] any [adj] period	57
5	during [det] [adj] period	46
6	[prep] that [adj] period	45
7	of [det] [adj] period	44
8	[prep] [det] [adj] periods	37
9	for [det] [adj] period	33
10	[prep] [det] early period	18
11	[prep] [det] particular period	17
12	over [det] [adj] period	16
13	at [det] [adj] period	15
14	[prep] [det] other period	11
15	[prep] some [adj] period	11
16	[prep] all [adj] period	10
17	[prep] each [adj] period	10
18	[prep] [det] five-year period	10
19	[prep] [det] interim period	9
20	[prep] [det] given period	9
21	through [det] [adj] period	9
22	within [det] [adj] period	8
23	from [det] [adj] period	8
24	[prep] [det] long period	8
25	[prep] [det] initial period	7
26	[prep] [det] short period	7
27	to [det] [adj] period	7
28	[prep] such [adj] period	7
29	[prep] [det] difficult period	7
30	[prep] these [adj] period	6