i understand what you mean. if the err frq is ~1/10K, yeah, that is too high for general substitution in dicts, i agree. but in flashcards, and w the user being aware of having selected an option "hide pinyin in flashcars before answ" or "convert pinyin to zhuyin in flashcards / answers" maybe its ok. also it is w flashcards, in "mental imprinting mode", where pinyin may disturb most (either before an answ or in an answ where some prefer studying pronunciation w zhuyin). thanks for your replies, for taking it into consideration