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Place where two or more rivers meet

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The study of earthquakes

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 Story of an individual written by himself

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One who supervises students in an examination hall

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 Unable to speak distinctly or express oneself clearly

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The rich man was known all throughout the country for his noble deeds, kindness and as one who makes an active effort to promote human welfare.

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 A piece of a living tissue or plant that is transplanted surgically

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A person who is absolutely necessary for someone or something