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Although it is appearing in the heart of the pre-Halloween season, 13th is not a film about triskaidekaphobia or hockey-masked serial killers; its horrors are deeper and more pervasive. The title of Ava DuVernay's powerful new documentary refers to the thirteenth amendment to the Constitution, which abolished slavery in the United States but retains a significant loophole: "...except as a punishment for crime whereof the party shall have been duly convicted."…