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The caste system divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. ... The main castes were further divided into about 3,000 castes and 25,000 sub-castes, each based on their specific occupation. Outside of this Hindu caste system were the achhoots - the Dalits or the untouchable
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The third rail of a nation's politics is a metaphor for any issue so controversial that it is "charged" and "untouchable" to the extent that any politician or public official who dares to broach the subject will invariably suffer politically. The metaphor comes from the high-voltage third rail in some electric railway systems.
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Answer: The adjective "medieval" (or sometimes "mediaeval" or "mediæval"), meaning pertaining to the Middle Ages, derives from medium aevum. Medieval writers divided history into periods such as the "Six Ages" or the "Four Empires", and considered their time to be the last before the end of the world.
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