3 :0".stdin load'plot'
if.y=1 do.wd'XYZ'else.b=.<:g=.>.-:y
wd@dtb"1(a{' X'),.(' Y'{~(g{.a),b#,:b{a=.(+.|.)f),.' Z'{~(|.f=.=i.y)+.#:>:2^y-1
end.
)