function Refuel()
	if turtle.getFuelLevel() < 10 then
	turtle.refuel(1)
end

function ForwardDouble()
        Refuel()
	turtle.dig()
        turtle.forward()
        turtle.digUp()
end

function turnLeft()
	turtle.turnLeft()
	ForwardDouble()
	turtle.turnLeft()
end

function turnRight()
	turtle.turnRight()
	ForwardDouble()
	turtle.turnRight()
end

function ThereandBack()
	for i=1,49 do
		ForwardDouble()
	end
	turnRight()
end
	for y=1,49 do
		ForwardDouble()
	end
	turnLeft()
end
end

for a=1,24 do
	ThereandBack()
end
for b=1,49 do
	ForwardDouble()
end