is there a formula of memory curve that you can add to the memory progress circles so that they will gradually decrease over time just like our memory curve, then if we review them, it will be full circle again. And if we review them enough times, the decrease rate will drop and will require less review than the newly memorized verses. In this way we can easily manage the review visually. This will be better than individual review reminder for each verse which will be overwhelming if we have a large amount of verses memorized.