code: private static void addOddParityEntries(Map<Direction, Map<Parity, String>> m) {
          m.get(Direction.BOTTOM).put(Parity.ODD, m.get(Direction.LEFT).get(Parity.EVEN));
          m.get(Direction.TOP).put(Parity.ODD, m.get(Direction.RIGHT).get(Parity.EVEN));
          m.get(Direction.LEFT).put(Parity.ODD, m.get(Direction.BOTTOM).get(Parity.EVEN));
          m.get(Direction.RIGHT).put(Parity.ODD, m.get(Direction.TOP).get(Parity.EVEN));
      }
docs: Puts odd parity entries in the map m based purely on the even entries.
  
  @param m
  map