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  Signals for AB blood to start falling in love:

People with blood type   A and B like to be well-dressed, brand-named, refreshing, simple and elegant, and to talk about academic and artistic topics.

  The indifferent and crisp AB type will never tell the feeling even if he intuitively feels that the other party is good. The attitude presented is very cold and ordinary, but it seems indifferent. In fact, when he observes your actions carefully, it means that he has a good impression of you.