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