turtle.back()
for i=1,3 do
    for j=1,3 do
		if (i % 2 ~= 0)
		then
        	turtle.back()
		end
        turtle.dig()
    end
    if (i % 2 ~= 0)
        then
            turtle.turnLeft()
            turtle.forward()
            turtle.turnLeft()
        else
            turtle.turnRight()
            turtle.forward()
            turtle.turnRight()
        end
end