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Jul 26th, 2017
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  1. N, S, E, W = 1, 2, 4, 8
  2. IN = 0x10
  3. DX = { E => 1, W => -1, N => 0, S => 0 }
  4. DY = { E => 0, W => 0, N => -1, S => 1 }
  5. OPPOSITE = { E => W, W => E, N => S, S => N }
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