startup

while true do
  turtle.select(16)
  turtle.refuel()
  turtle.select(13)
  while true do
    if turtle.compare() then break end
    turtle.turnLeft()
  end
  print("ok")
  turtle.select(1)
  turtle.drop()
  turtle.suck(1)
  turtle.turnLeft()
  turtle.select(16)
  turtle.suck()
  turtle.turnLeft()
  turtle.select(3)
  turtle.drop()
  turtle.suck(1)
  turtle.turnLeft()
  turtle.forward()
  turtle.turnLeft()
  turtle.select(2)
  turtle.drop()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.select(4)
  turtle.drop()
  turtle.suck()
  turtle.turnLeft()
  turtle.select(5)
  while true do
    if turtle.detect() then break end
    turtle.forward()
    if not turtle.compareDown() then
      turtle.back()
      break
    end
  end
  turtle.select(3)
  if not turtle.detect() then turtle.place() end
  turtle.select(1)
  if not turtle.compare() then
    while not turtle.compare() do
      turtle.select(4)
      turtle.place()
      turtle.select(1)
    end
  end
  turtle.select(1)
  turtle.dig()
  turtle.forward()
  while turtle.compareUp() do
    turtle.digUp()
    turtle.up()
  end
  while not turtle.detectDown() do
    turtle.down()
  end
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.select(14)
  while not turtle.detect() do
    turtle.forward()
  end
  print("ok")
end