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when there are prohibitions to intermarry between castes.
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Lower castes are usually seen as polluted,
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as dirty; you even cannot touch them,
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or if you did touch a low class person,
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let's say in Indian culture,
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you have to go some purification procedures. Right?
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And he said status groups--segregation grows into castes,
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that transforms a horizontal coexistence
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of ethnically segregated groups into a vertical social system.
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This is also very important--right?--his notion of ethnicity.
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It's a very innovative idea in writing this around 1920,
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about this. Right?