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