SN4 ""

No	Pattern	Freq
1	[noun] [prep] the problem of	564
2	[noun sg] [prep] the problem of	459
3	[verb] [prep] the problem of	417
4	[adj] [prep] the problem of	196
5	[vb pp] [prep] the problem of	141
6	solution [prep] the problem of	133
7	solution [prep] the problem of	105
8	[noun pl] [prep] the problem of	100
9	[to-vb] [prep] the problem of	97
10	[adj] [prep] the problem of	84
11	deal [prep] the problem of	83
12	[det] [prep] the problem of	76
13	[adv] [prep] the problem of	75
14	[v-ing] [prep] the problem of	59
15	[adv] [prep] the problem of	55
16	[conj] [prep] the problem of	52
17	[vb -s] [prep] the problem of	40
18	to deal [prep] the problem of	39
19	[pron] [prep] the problem of	38
20	[subord] [prep] the problem of	37
21	approach [prep] the problem of	36
22	some [prep] the problem of	35
23	some [prep] the problem of	35
24	[num] [prep] the problem of	34
25	one [prep] the problem of	33
26	one [prep] the problem of	33
27	because [prep] the problem of	33
28	answer [prep] the problem of	33
29	because [prep] the problem of	33
30	approach [prep] the problem of	32