SN4 ""

No	Pattern	Freq
1	[noun] who had previously [verb]	40
2	[noun pl] who had previously [verb]	21
3	[noun sg] who had previously [verb]	13
4	[adj] who had previously [verb]	11
5	[det] who had previously [verb]	10
6	those who had previously [verb]	8
7	those who had previously [verb]	8
8	patient who had previously [verb]	6
9	patients who had previously [verb]	5
10	who had [adv] previously [verb]	6
11	who had not previously [verb]	5
12	who had [not/n't] previously [verb]	5
13	who had not previously [verb]	5
14	who had previously been [verb]	16
15	who had previously be [verb]	16
16	who had previously [been] [verb]	16
17	who had previously [be] [verb]	16
18	who had previously [verb] [prep]	23
19	who had previously [verb] [prep]	23
20	who had previously [verb] [noun]	18
21	who had previously [verb] [art]	12
22	who had previously [verb] [art]	12
23	who had previously [verb] [adj]	10
24	who had previously [verb] [noun sg]	8
25	who had previously [verb] the	7
26	who had previously [verb] the	7
27	who had previously [verb] in	6
28	who had previously [verb] in	6
29	who had previously [verb] for	5
30	who had previously [verb] [adj]	5