00:difficulty: easy
01:difficulty: easy
02:difficulty: easy
03:difficulty: easy
04:difficulty: easy
05:difficulty: easy
06:difficulty: easy
07:difficulty: easy
08:difficulty: easy
09:difficulty: easy
0A:difficulty: easy
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: intermediate
17:difficulty: intermediate
18:difficulty: intermediate
19:difficulty: intermediate
1A:difficulty: medium
1B:difficulty: medium
1C:difficulty: medium
1D:difficulty: medium
1E:difficulty: medium
1F:difficulty: medium
20:difficulty: medium
21:difficulty: medium
22:difficulty: medium
23:difficulty: hard
24:difficulty: hard
25:difficulty: hard
26:difficulty: hard