When they met for the first time, she followed the principle of picking up memories on the road and returning the money to the owner, but she was defrauded of 20 yuan. The second and third times, based on the principle of repaying injustice with injustice, resulted in a small victory. For the Nth time, she slipped and fell in. Then we embarked on the road of traps and being cheated, and we don't know who cheated whom.