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Answer:
Mrs Groover was a strict principal of the narrator's school. She was a disciplinarian during her time as a principal but when she learnt that the boys were in his backyard to chant Unke Munke Timpletoo, she treated them understandingly and allowed them to finish their rounds around the tree. This shows that even though she has a strict exterior, in reality, she is an understanding and kindhearted person.
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