13
|
11 rather good
|
7 reasonably difficult
|
3 rather hard
|
14
|
11 rather good
|
7 reasonably difficult
|
3 rather hard
|
15
|
11 rather good
|
8 quite easy
|
4 hard
|
16
|
11 rather good
|
8 quite easy
|
4 hard
|
17
|
11 rather good
|
8 quite easy
|
5 pretty hard
|
18
|
11 rather good
|
8 quite easy
|
5 pretty hard
|
19
|
11 rather good
|
8 quite easy
|
6 quite hard
|
20
|
11 rather good
|
8 quite easy
|
6 quite hard
|
21
|
11 rather good
|
9 pretty easy
|
7 reasonably hard
|
22
|
11 rather good
|
9 pretty easy
|
7 reasonably hard
|
23
|
11 rather good
|
9 pretty easy
|
8 quite easy
|
|
|