easy	00
easy	01
easy	02
easy	03
easy	04
easy	05
easy	06
easy	07
intermediate	08
intermediate	09
intermediate	0A
intermediate	0B
intermediate	0C
intermediate	0D
intermediate	0E
intermediate	0F
intermediate	10
intermediate	11
intermediate	12
intermediate	13
intermediate	14
intermediate	15
intermediate	16
intermediate	17
intermediate	18
intermediate	19
intermediate	1A
intermediate	1B
intermediate	1C
intermediate	1D
medium	1E
medium	1F
medium	20
medium	21
medium	22
medium	23
medium	24
medium	25
medium	26
medium	27
medium	28
medium	29
medium	2A
medium	2B
medium	2C
medium	2D
medium	2E
medium	2F
medium	30
medium	31
medium	32
medium	33
medium	34
medium	35
medium	36
medium	37
medium	38
medium	39
medium	3A
medium	3B
medium	3C
medium	3D
medium	3E
medium	3F
medium	40
medium	41
medium	42
medium	43
medium	44
medium	45
medium	46
medium	47
medium	48
medium	49
medium	4A
medium	4B
medium	4C
medium	4D
medium	4E
medium	4F
medium	50
medium	51
medium	52
medium	53
medium	54
medium	55
medium	56
medium	57
medium	58
medium	59
medium	5A
medium	5B
medium	5C
medium	5D
medium	5E
medium	5F
medium	60
medium	61
medium	62
medium	63
medium	64
medium	65
hard	66
hard	67
hard	68
hard	69
hard	6A
hard	6B
hard	6C
hard	6D
hard	6E
hard	6F
hard	70
hard	71
hard	72
hard	73
hard	74
hard	75
hard	76
challenging	77
challenging	78
challenging	79
challenging	7A
challenging	7B