SN4 ""

No	Pattern	Freq
1	at which [noun]	816
2	at which [noun sg]	363
3	at which [noun pl]	245
4	at which [noun prp]	174
5	at which time	67
6	at which time	66
7	at which [n mass]	27
8	at which point	20
9	at which point	20
10	at which people	16
11	at which people	16
12	at which women	11
13	at which woman	11
14	at which children	10
15	at which child	10
16	at which moment	9
17	at which moment	9
18	at which mr	8
19	at which mr	8
20	at which [letter]	7
21	at which price	7
22	at which price	6
23	at which stage	6
24	at which material	6
25	at which accounts	6
26	at which stage	6
27	at which account	6
28	at which word	5
29	at which words	5