function refill()
        for y = 1,16 do
                turtle.select(1)
                turtle.select(y)
                turtle.suckUp()
        end
end

refill()

local even = false
  for k = 1,13 do
        for i = 1,24 do
            turtle.dig()
            turtle.place()
            turtle.back()
        end

        if even == false then
            turtle.turnRight()
            turtle.back()
            turtle.turnRight()
            even = true

        else if even == true then
            turtle.turnLeft()
            turtle.back()
            turtle.turnLeft()
            even = false
        end
			end
	end
  for k = 1,9 do
       for i = 1,18 do
            turtle.dig()
            turtle.place()
            turtle.back()
				if i == 18 then
					turtle.dig()
				end
       end

	if even == false then
        turtle.turnRight()
        turtle.back()
        turtle.turnRight()
        even = true

    else if even == true then
        turtle.turnLeft()
        turtle.back()
        turtle.turnLeft()
        even = false
    end
	end
  end

  function goHome()
	turtle.turnRight()
	for i=1,9 do
		turtle.forward()
	end
	turtle.turnLeft()
	for i = 1,5 do
		turtle.forward()
	end
	turtle.turnRight()
	for i = 1,13 do
		turtle.forward()
	end
	turtle.turnLeft()
  end

goHome()