SN4 ""

No	Pattern	Freq
1	[verb] a major [noun sg] to	152
2	[verb] a major [noun] to	152
3	[verb] a major contribution to	59
4	[verb] a major contribution to	59
5	make a major [noun] to	57
6	[vb past] a major [noun] to	41
7	[vb -s] a major [noun] to	27
8	[vb pp] a major [noun] to	26
9	[v-ing] a major [noun] to	17
10	[vb infin] a major [noun] to	16
11	made a major [noun] to	16
12	[verb] a major threat to	14
13	[verb] a major threat to	14
14	provide a major [noun] to	14
15	[vb base] a major [noun] to	14
16	made a major [noun] to	13
17	[to-vb] a major [noun] to	11
18	represent a major [noun] to	9
19	[verb] a major obstacle to	8
20	[verb] a major obstacle to	8
21	pose a major [noun] to	8
22	making a major [noun] to	8
23	present a major [noun] to	8
24	[verb] a major challenge to	7
25	[verb] a major boost to	7
26	[verb] a major boost to	7
27	[verb] a major challenge to	7
28	represents a major [noun] to	6
29	give a major [noun] to	6
30	makes a major [noun] to	6