turtle.select(1);
turtle.refuel(1);

for i=0,10 do
turtle.dig();
while turtle.detect() do
	sleep(0.8);
	turtle.dig();
end
turtle.forward();

turtle.digUp();
while turtle.detectUp() do
	sleep(0.8);
	turtle.digUp();
end
turtle.up();

turtle.dig();
while turtle.detect() do
	sleep(0.8);
	turtle.dig();
end
turtle.forward();

turtle.digDown();
turtle.down();

if i % 4 == 0 then
	turrtle.select(16);
	turle.placeUp();
end
if turtle.getFuelLevel() < 20 then
	turtle.select(1);
	turtle.refuel(1);
end

end