while turtle.getFuelLevel() == 0 do
    turtle.refuel()
end
block = 9
level = 0
turtle.digDown()
turtle.down()
while true do
    if block == 9 then
        for i=1,3 do
            for b=1,block do
                turtle.dig()
                turtle.forward()
            end
            turtle.turnRight()
            print(key)
        end
        block = block - 1
    else
        for i=1,2 do
            for b=1,block do
                turtle.dig()
                turtle.forward()
            end
            turtle.turnRight()
            print(turtle.getFuelLevel())
        end
        block = block -1
    end
    if block == 0 then
        while turtle.detect() == false do
            turtle.forward()
        end
        turtle.turnLeft()
        while turtle.detect() == false do
            turtle.forward()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        turtle.digDown()
        turtle.down()
        block = 9
        level = level + 1
        if level == turtle.getFuelLevel() then
            for i=1,level do
                turtle.up()
            end
            while turtle.getFuelLevel() <= 8 do
                turtle.getFuelLevel()
            end
            while turtle.detectDown == false do
                turtle.down()
            end
        end
    end
end