SN4 ""

No	Pattern	Freq
1	of [noun] [be] required	230
2	of [noun] be required	230
3	of [noun] [is] required	148
4	of [noun] is required	148
5	of [noun] [noun] required	51
6	of [noun] [was/were] required	42
7	of [noun] are required	36
8	of [noun] [am/are] required	36
9	of [noun] was required	30
10	of [noun] [noun sg] required	26
11	of [noun] [noun pl] required	25
12	of [noun] [conj] required	18
13	of [noun] [subord] required	15
14	of [noun] were required	12
15	of [noun] as required	10
16	of [noun] as required	10
17	of [noun] [adv] required	9
18	of [noun] [adv] required	7
19	[noun] of [noun] required	519
20	[noun sg] of [noun] required	439
21	number of [noun] required	81
22	number of [noun] required	78
23	[noun pl] of [noun] required	78
24	amount of [noun] required	62
25	amount of [noun] required	59
26	level of [noun] required	52
27	level of [noun] required	48
28	type of [noun] required	41
29	type of [noun] required	31
30	degree of [noun] required	27