print("starting...")
local pos = 0

for x=1,200 do
if turtle.forward(1) then
  pos = pos + 1
  turtle.digDown()
  turtle.digUp()
else
  if turtle.dig() then 
    if turtle.forward(1) then
      pos = pos + 1
      turtle.digDown()
      turtle.digUp()
    end
  end
end
if x%9==1 then
  turtle.select(1)
  turtle.placeDown()
end
end

for x=1,pos do
  turtle.back()
end
turtle.turnLeft()
turtle.turnLeft()
for x=2,16 do
  turtle.select(x)
  turtle.drop()
end

turtle.turnLeft()
turtle.turnLeft()