00:difficulty: easy
01:difficulty: easy
02:difficulty: easy
03:difficulty: easy
04:difficulty: easy
05:difficulty: easy
06:difficulty: intermediate
07:difficulty: intermediate
08:difficulty: intermediate
09:difficulty: intermediate
0A:difficulty: intermediate
0B:difficulty: intermediate
0C:difficulty: intermediate
0D:difficulty: intermediate
0E:difficulty: intermediate
0F:difficulty: intermediate
10:difficulty: intermediate
11:difficulty: intermediate
12:difficulty: intermediate
13:difficulty: intermediate
14:difficulty: intermediate
15:difficulty: intermediate
16:difficulty: medium
17:difficulty: medium
18:difficulty: medium
19:difficulty: medium
1A:difficulty: medium