SN4 ""

No	Pattern	Freq
1	at three [noun]	205
2	at three [noun]	205
3	at three [noun pl]	170
4	at three level	34
5	at three levels	34
6	at three month	26
7	at three months	25
8	at three [noun sg]	17
9	at three [noun prp]	12
10	at three point	10
11	at three year	9
12	at three week	9
13	at three years	9
14	at three weeks	8
15	at three points	8
16	at three minutes	7
17	at three minute	7
18	at three site	6
19	at three time	6
20	at three times	6
21	at three sites	6
22	at three pound	5