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Who can explain the meaning of this joke?

That is, the old lady heard a kiss and a slap in the face and thought that A or B kissed the girl, and then the girl slapped the person who kissed her. The girl thought that A or B kissed the old lady. A thought B kissed the little girl, but the little girl hit him. In fact, B just kissed his hand. The other three people think too much. Is it detailed enough?