Y1 easy X1
Y2 easy X1 
Y3 easy X1
Y4 easy X1
Y5 easy X1
Y6 easy X1
Y7 easy X1
Y8 easy X1
Y9 easy X1
Y10 easy X1
Y11 medium X1
Y12 medium X1
Y13 medium X1
Y14 medium X1
Y15 medium X1
Y16 medium X1
Y17 medium X1
Y18 medium X1
Y19 medium X1
Y20 medium X1
Y21 difficult X1
Y22 difficult X1
Y23 difficult X1
Y24 difficult X1
Y25 difficult X1
Y26 difficult X1
Y27 difficult X1
Y28 difficult X1
Y29 difficult X1
Y30 difficult X1
Y31 easy X2
Y32 easy X2
Y33 easy X2
Y34 easy X2
Y35 easy X2
Y36 medium X2
Y37 medium X2
Y38 medium X2
Y39 medium X2
Y40 medium X2
Y41 difficult X2
Y42 difficult X2
Y43 difficult X2
Y44 difficult X2
Y45 difficult X2
Y46 easy X3
Y47 easy X3
Y48 easy X3
Y49 easy X3
Y50 easy X3
Y51 easy X3
Y52 medium X3
Y53 medium X3
Y54 medium X3
Y55 medium X3
Y56 medium X3
Y57 medium X3
Y58 medium X3
Y59 medium X3
Y60 medium X3
Y61 medium X3
Y62 difficult X3
Y63 difficult X3
Y64 difficult X3
Y65 difficult X3
Y66 difficult X3
Y67 difficult X3
Y68 difficult X3
Y69 difficult X3
Y70 difficult X3
Y71 difficult X3
Y72 easy X4
Y73 easy X4
Y74 easy X4
Y75 easy X4
Y76 easy X4
Y77 easy X4
Y78 easy X4
Y79 easy X4
Y80 medium X4
Y81 medium X4
Y82 medium X4
Y83 medium X4
Y84 medium X4
Y85 medium X4
Y86 medium X4
Y87 medium X4
Y88 difficult X4
Y89 difficult X4
Y90 difficult X4
Y91 difficult X4
Y92 difficult X4
Y93 difficult X4
Y94 difficult X4
Y95 difficult X4