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What does the fortune teller mean by bad luck?

The fortune teller said it was unlucky.

This fortune teller can't be trusted. Let me give you an example. I said that there was an accident recently and I went to find a master to do the math. The master shook his head for a while and asked: You don't have a black dog at home, to tell the truth! If you say yes, then he will say, look, the problem lies with this black dog. This is the black dog. Go back and deal with it! If you say no, he will say, you see, this is the problem. Your family lacks a black dog town house!