SN4 ""

No	Pattern	Freq
1	at about [num] [noun]	209
2	at about [adj] [noun pl]	145
3	at about [adj] [n mass]	46
4	at about [adj] foot	18
5	at about [adj] feet	18
6	at about [adj] miles	17
7	at about [adj] mile	17
8	at about [adj] [noun prp]	11
9	at about [adj] months	10
10	at about [adj] years	10
11	at about [adj] month	10
12	at about [adj] year	10
13	at about [adj] week	10
14	at about [adj] weeks	10
15	at about [adj] degrees	9
16	at about [adj] metre	9
17	at about [adj] degree	9
18	at about [adj] metres	9
19	at about [adj] [noun sg]	9
20	at about three [noun]	8
21	at about [adj] hour	8
22	at about three [noun]	8
23	at about [adj] hours	8
24	at about 50 [noun]	7
25	at about [adj] pence	7
26	at about [adj] pence	7
27	at about ten [noun]	7
28	at about 50 [noun]	7
29	at about ten [noun]	7
30	at about [adj] [noun]	6