b NCTF
b a g e d b h f d b h f d b h f c
b g e
c h f d a f d b g d b g d b g d a
f d f
b g d h e b f c g c h d h e
a e a
e b f b f b f a e a c h f b e
d b h
f d b h f d b h e c a f d a g
e b h
f c h f c h e c h d a f c h e
b g d
h e a f c g d h e a e a f b f
b f b
g c g b d f h b d f h b c e g
a b d
