SN4 ""

No	Pattern	Freq
1	[noun] [prep] [art] [num ord] twenty years	90
2	[noun] [prep] the [num ord] twenty years	90
3	[noun] [prep] [art] [num ord] twenty years	90
4	[noun] [prep] [art] last twenty years	63
5	[noun sg] [prep] [art] [num ord] twenty years	53
6	[noun pl] [prep] [art] [num ord] twenty years	31
7	[noun] over [art] [num ord] twenty years	30
8	[noun] over [art] [num ord] twenty years	30
9	[noun] [prep] [art] next twenty years	25
10	[noun] for [art] [num ord] twenty years	21
11	[noun] for [art] [num ord] twenty years	21
12	[noun] in [art] [num ord] twenty years	18
13	[noun] in [art] [num ord] twenty years	18
14	[noun] of [art] [num ord] twenty years	10
15	[noun] of [art] [num ord] twenty years	10
16	[noun] during [art] [num ord] twenty years	9
17	[noun] during [art] [num ord] twenty years	9
18	[noun prp] [prep] [art] [num ord] twenty years	6