Due to the micro-learning principle, practice sessions are designed to be divided into short units. Therefore, a maximum of 10 cards are drawn from the pool of the deck, topic or skill per session. For example, if your deck has fewer than 10 cards, the same cards will always be shown per session.
After all cards have been answered once, the cards are repeated based on the laearning algorithm, which asks the right questions at the right time. You can find more detailed information on selection based on the learning algorithm in the articleHow does the learning algorithm in ovos play work?