| http://www.w3.org/ns/prov#value | - Some, like Farmhouse or Triangle, do not use Greek letters; others, like Delta Upsilon, are open societies rather than secret societies, but for the most part they take the same model: letters representing a secret motto or principles; a creed or other philosophical basis for organization; and public and private tests for identifying members, such as a badge or secret handclasp.
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