4x1y
3x1yxf
2x1yx
1x1y
0x1yxf
f70yxf
e70yx
d70y
c70yxf
b70yx
qg0yx
pg0y
og0yxf
ng0yx
mg0y
1pzy
0pzyxf
zpzyx
ypzy
xpzyxf
czyyxf
bzyyx
azyy
9yyyxf
8yyyx