while true do
    for i = 1, 13 do
        local _, data = turtle.inspectDown()
        if data.state.age == 3 then turtle.digDown() end
        turtle.suckDown()
        turtle.placeDown()
        turtle.forward()
    end
    turtle.dropDown()
    for i = 1, 13 do
        turtle.back()
        turtle.suckDown()
    end
end