function digThreeForOne()
	turtle.dig()
	turtle.forward()
	turtle.turnLeft()
	turtle.dig()
	turtle.turnLeft()
	turtle.turnLeft()
	turtle.dig()
	turtle.turnLeft()
	turtle.back()
end

function digThreeForThree()
	for i=0,2,1 do
	digThreeForOne()
	turtle.forward()
	end
	for i=0,3,1 do
	turtle.back()
	end
end

digThreeForThree()