He assumed that the rats were making the sound because he thought the sound was a familiar one. The doctor kept hearing the thuds from the roof. He heard the sound 4 times and only in the fourth time when the sound stopped a Cobra snake cam down.
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Hari Shakthi Vel answered this
The sound was done by the snake.
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Mayank answered this
He was not sure for the sound becauseit he was familiarwith that sound which wss of rats.literature is all about imagination my friend
