SN4 ""

No	Pattern	Freq
1	at [Wh det] [noun]	1277
2	at which [noun]	816
3	at [Wh det] [noun sg]	749
4	at what [noun]	339
5	at [Wh det] [noun pl]	286
6	at [Wh det] [noun prp]	205
7	at [Wh det] time	113
8	at [Wh det] time	111
9	at [Wh det] point	84
10	at [Wh det] point	84
11	at whatever [noun]	80
12	at [Wh det] level	52
13	at [Wh det] level	48
14	at [Wh det] stage	42
15	at [Wh det] stage	41
16	at [Wh det] price	36
17	at whose [noun]	35
18	at [Wh det] price	34
19	at [Wh det] [n mass]	30
20	at [Wh det] age	26
21	at [Wh det] age	25
22	at [Wh det] people	18
23	at [Wh det] people	18
24	at [Wh det] cost	18
25	at [Wh det] cost	18
26	at [Wh det] moment	15
27	at [Wh det] moment	15
28	at [Wh det] women	11
29	at [Wh det] children	11
30	at [Wh det] woman	11