a

turtle.select(1)
turtle.refuel()

while true do
turtle.forward()
turtle.forward()
turtle.select(2)
turtle.place()
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.turnRight()
turtle.turnRight()
turtle.forward()
turtle.forward()
turtle.select(3)
turtle.place()
turtle.back()
turtle.up()
end