to maketurtle :turtle :pen
localmake "saveturtle turtle
setturtle :turtle
pu
setpos butlast butlast :pen
pd
setheading last butlast :pen
localmake "maybeoutput runresult last :pen
setturtle :saveturtle
if emptyp :maybeoutput [stop]
output first :maybeoutput
end
bury "maketurtle