SN4 ""

No	Pattern	Freq
1	[art] long period [prep]	304
2	[art] long period [prep]	304
3	a long period [prep]	245
4	a long period [prep]	245
5	[prep] long period [prep]	175
6	[prep] long period [prep]	175
7	for long period [prep]	121
8	for long period [prep]	121
9	the long period [prep]	58
10	the long period [prep]	58
11	[adv] long period [prep]	56
12	[verb] long period [prep]	55
13	[adv] long period [prep]	52
14	over long period [prep]	26
15	over long period [prep]	26
16	spend long period [prep]	19
17	[adj] long period [prep]	14
18	very long period [prep]	13
19	very long period [prep]	13
20	relatively long period [prep]	10
21	[vb past] long period [prep]	10
22	relatively long period [prep]	10
23	[vb infin] long period [prep]	9
24	[v-ing] long period [prep]	9
25	[to-vb] long period [prep]	9
26	[vb base] long period [prep]	8
27	[det] long period [prep]	8
28	quite long period [prep]	7
29	quite long period [prep]	7
30	much long period [prep]	7