turtle.refuel()
i = 0
while turtle.detectDown() do
	turtle.digDown()
	turtle.down()
	turtle.turnLeft()
	turtle.dig()
	turtle.turnRight()
	turtle.turnRight()
	turtle.dig()
	turtle.turnLeft()
	while i < 3 do
		turtle.dig()
		turtle.forward()
		turtle.turnRight()
		turtle.dig()
		turtle.turnLeft()
		turtle.turnLeft()
		turtle.dig()
		turtle.turnRight()
		i = i + 1
	end
	turtle.back()
	turtle.back()
	i = 0
end