“The sound was a familiar one.” What sound did the doctor hear? What did he think it was? How many times did he hear it? (Find the places in the text.) When and why did the sounds stop?

The doctor lived in a room which was full of rats. He could hear the rats all day long. There was a regular inflow and outflow of rats to and from the beam. He heard the sound thrice and the sound stopped all of a sudden as rats saw a snake.

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