SN4 ""

No	Pattern	Freq
1	[adv] [adj] period [prep]	245
2	[adv] [adj] period [prep]	214
3	[adv] [adj] period of	154
4	[adv] [adj] period of	154
5	[adv] short period [prep]	67
6	[adv] short period [prep]	62
7	very [adj] period [prep]	60
8	most [adj] period [prep]	49
9	[adv] [adj] period in	46
10	[adv] [adj] period in	46
11	relatively [adj] period [prep]	43
12	[adv] long period [prep]	29
13	[adv] long period [prep]	24
14	[adv] [adj] period for	18
15	[adv] [adj] period for	18
16	[adv] [det] period [prep]	16
17	[adv] [adj -er] period [prep]	11
18	[adv] brief period [prep]	7
19	[adv] brief period [prep]	7
20	much [adj] period [prep]	7
21	[adv] [adj] period between	7
22	[adv] [adj] period between	7
23	[adv] active period [prep]	5
24	[adv] difficult period [prep]	5
25	[adv] important period [prep]	5
26	[adv] lengthy period [prep]	5
27	particularly [adj] period [prep]	5
28	[adv] early period [prep]	5
29	more [adj] period [prep]	5
30	[adv] difficult period [prep]	5