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In page Richard Francis Burton:

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While in India, he became a proficient speaker of Persian and Arabic, as well as Hindustani, Gujarati, Punjabi, Sindhi, Saraiki, and Marathi,[citation needed] having passed six formal language examinations, and being in the process of studying for two more.[3] (And while in the Bombay Army, he kept a large menagerie of tame monkeys in the hopes of learning their language, and has been quoted as stating he had accumulated sixty "words" of their speech.[5][3]: 56–65 )