SN4 ""

No	Pattern	Freq
1	[verb] [adv] period	39
2	[vb base] [adv] period	37
3	follow [adv] period	36
4	follow [adv] period	36
5	[noun] [adv] period	5
6	[adv] [adj] period	499
7	[adv] [adj] period	407
8	[adv] [art] period	223
9	[adv] [art] period	223
10	[adv] a period	152
11	[adv] a period	152
12	[adv] short period	105
13	[adv] short period	94
14	[adv] the period	71
15	[adv] the period	71
16	[adv] long period	68
17	[adv] [adj -er] period	44
18	[adv] long period	42
19	[adv] [det] period	38
20	[adv] longer period	26
21	[adv] [prep] period	17
22	[adv] [prep] period	17
23	[adv] this period	15
24	[adv] this period	15
25	[adv] brief period	14
26	[adv] brief period	14
27	[adv] [verb] period	13
28	[adv] difficult period	13
29	[adv] difficult period	13
30	[adv] recent period	12