r16 circle

function forward()
	refuel();
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
end

function up()
	refuel();
    while turtle.detectUp() do
        turtle.digUp()
    end
    turtle.up()
end

function selectSlot()
	while turtle.getItemSpace() == 64 do
		emptySlot = true;
		for i=1, 15 do
			if emptySlot then
				turtle.select(i)
				emptySlot = turtle.getItemSpace() == 64
			end
		end
	end
end

function refuel()
    while turtle.getFuelLevel() == 0 do
		turtle.select(16)
        turtle.refuel()
    end
	turtle.select(1)
	selectSlot()
end

function placeDown()
	while turtle.detectDown() do
		turtle.digDown()
	end
	selectSlot()
	turtle.placeDown()
end

function unp()
	up()
	p()
end

function fnp()
	forward()
	p()
end

function f()
	forward()
end

function r()
	turtle.turnRight()
end

function l()
	turtle.turnLeft()
end

function rfl()
	r()
	f()
	l()
end

function flfrp()
	f()
	l()
	fnp()
	r()
end

function p()
	placeDown()
end

while true do
	up()
	for i = 1, 4 do
p()
fnp()
fnp()
fnp()
fnp()
rfl()
fnp()
fnp()
rfl()
fnp()
fnp()
rfl()
fnp()
rfl()
fnp()
rfl()
fnp()
rfl()
fnp()
rfl()
fnp()
r()
fnp()
flfrp()
fnp()
flfrp()
fnp()
fnp()
fnp()
f()
	end
end