SN4 ""

No	Pattern	Freq
31	[prep] 20 years	501
32	[prep] seven years	495
33	[prep] seven years	495
34	over [adj] years	446
35	[prep] six years	443
36	[prep] six years	443
37	[prep] twenty years	396
38	[prep] twenty years	396
39	[prep] [adj -er] years	367
40	[prep] 30 years	315
41	[prep] 30 years	315
42	[prep] eight years	300
43	[prep] eight years	300
44	[prep] late years	288
45	[prep] 15 years	284
46	[prep] 15 years	284
47	[prep] later years	270
48	[prep] 25 years	261
49	[prep] 25 years	261
50	[prep] previous years	249
51	[prep] previous years	249
52	[prep] thirty years	225
53	[prep] thirty years	225
54	from [adj] years	221
55	[prep] these years	220
56	[prep] these years	220
57	at [adj] years	216
58	[prep] 40 years	202
59	[prep] 40 years	202
60	[prep] 12 years	193