SN4 ""

No	Pattern	Freq
1	[art] long period	447
2	[art] long period	447
3	a long period	405
4	a long period	405
5	[prep] long period	348
6	[prep] long period	348
7	for long period	269
8	for long period	269
9	[adv] long period	93
10	[adv] long period	83
11	[verb] long period	64
12	over long period	48
13	over long period	48
14	the long period	41
15	the long period	41
16	spend long period	32
17	very long period	27
18	very long period	27
19	[adj] long period	20
20	[det] long period	14
21	relatively long period	13
22	relatively long period	13
23	[vb past] long period	12
24	[vb infin] long period	11
25	[vb pp] long period	10
26	[adv prt] long period	10
27	[vb base] long period	10
28	over long period	10
29	over long period	10
30	quite long period	10