SN4 ""

No	Pattern	Freq
1	difficult [to-vb] [prep] the [adj]	99
2	difficult [to-vb] [prep] the [adj]	99
3	difficult [to-vb] [prep] the [adj]	84
4	difficult [to-vb] in the [adj]	17
5	difficult [to-vb] with the [adj]	17
6	difficult [to-vb] with the [adj]	17
7	difficult [to-vb] in the [adj]	17
8	difficult to distinguish [prep] the [adj]	10
9	difficult [to-vb] from the [adj]	9
10	difficult [to-vb] from the [adj]	9
11	difficult [to-vb] to the [adj]	8
12	difficult [to-vb] to the [adj]	8
13	difficult [to-vb] between the [adj]	7
14	difficult [to-vb] between the [adj]	7
15	difficult [to-vb] on the [adj]	6
16	difficult [to-vb] [prep] the [num]	6
17	difficult [to-vb] on the [adj]	6
18	difficult [to-vb] for the [adj]	5
19	difficult [to-vb] within the [adj]	5
20	difficult [to-vb] for the [adj]	5
21	difficult [to-vb] [prep] the [num ord]	5
22	difficult [to-vb] within the [adj]	5