SN4 ""

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