function main()
  turtle.refuel()
  for k=1,2,1 do
    for i=1,10,1 do
      for j=1,5,1 do
        turtle.dig()
        turtle.dig()
        turtle.forward()
      end
      turtle.turnLeft()
      turtle.dig()
      turtle.dig()
      turtle.forward()
      turtle.turnLeft()
      for j=1,5,1 do
        turtle.dig()
        turtle.dig()
        turtle.forward()
      end
      turtle.turnRight()
      turtle.dig()
      turtle.dig()
      turtle.forward()
      turtle.turnRight()
    end
    turtle.digUp()
    turtle.up()
    for i=1,10,1 do
      for j=1,5,1 do
        turtle.dig()
        turtle.dig()
        turtle.forward()
      end
      turtle.turnRight()
      turtle.dig()
      turtle.dig()
      turtle.forward()
      turtle.turnRight()
      for j=1,5,1 do
        turtle.dig()
        turtle.dig()
        turtle.forward()
      end
      turtle.turnLeft()
      turtle.dig()
      turtle.dig()
      turtle.forward()
      turtle.turnLeft()
    end
    turtle.digUp()
    turtle.up()
  end
end

main()