Maybe I'm missing something, but ... After getting to about 500 words with one basic textbook, I added in a second basic textbook and Skritter started asking me basic words again, like 我 and 星期, saying they're from the second textbook, so I'm not talking about the occasional repeats of basic words that I would expect from the first textbook. It doesn't give me over-generous scores on the count of number of known words/characters, so the database must know that they're the same word ... so I don't know why it asks me them again, and more importantly I don't know how to stop it doing so. Anybody know?