turtle

if turtle.refuel(0) then
 turtle.refuel()
end

while turtle.detect() do
 turtle.dig()
 turtle.up()
 turtle.dig()
 turtle.up()
 turtle.dig()
 turtle.turnRight()
 turtle.forward()
 turtle.turnLeft()
 turtle.dig()
 turtle.down()
 turtle.dig()
 turtle.down()
 turtle.dig()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.turnRight()
 turtle.dig()
 turtle.up()
 turtle.dig()
 turtle.up()
 turtle.dig()
 turtle.turnRight()
 turtle.forward()
 turtle.turnLeft()
 turtle.down()
 turtle.down()
 turtle.forward()
end