local even = false
  for k = 1,13 do
                        for i = 1,23 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