code: static Character[] createCharacters() {
          int len = CHARACTER_UPPER_BOUND - CHARACTER_LOWER_BOUND + 1;
          Character[] ret = new Character[len];
          char val = (char) CHARACTER_LOWER_BOUND;
          for (int i = 0; i < len; i++, val++) {
              ret[i] = new Character(val);
          }
          return ret;
      }
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