SN4 ""

No	Pattern	Freq
1	[adv] difficult [to-vb]	3607
2	[adv] difficult [to-vb]	3329
3	very difficult [to-vb]	892
4	very difficult [to-vb]	892
5	more difficult [to-vb]	810
6	more difficult [to-vb]	810
7	[not/n't] difficult [to-vb]	274
8	not difficult [to-vb]	274
9	not difficult [to-vb]	250
10	extremely difficult [to-vb]	233
11	extremely difficult [to-vb]	233
12	[adv] difficult to get	158
13	often difficult [to-vb]	136
14	often difficult [to-vb]	136
15	[adv] difficult to find	133
16	increasingly difficult [to-vb]	130
17	increasingly difficult [to-vb]	130
18	so difficult [to-vb]	128
19	so difficult [to-vb]	128
20	[adv] difficult to see	118
21	too difficult [to-vb]	114
22	too difficult [to-vb]	114
23	quite difficult [to-vb]	97
24	quite difficult [to-vb]	97
25	[adv] difficult to achieve	86
26	most difficult [to-vb]	77
27	most difficult [to-vb]	77
28	[adv] difficult to understand	76
29	[adv] difficult to do	75
30	[adv] difficult to make	74