}
      return new Alphabet(name + ".ignoreCase()", chars, newDecodabet, /* ignoreCase= */ true);
    }

    char encode(int bits) {
      return chars[bits];
    }

    boolean isValidPaddingStartPosition(int index) {
      return validPadding[index % charsPerChunk];
    }

    boolean canDecode(char ch) {
      return ch <= Ascii.MAX && decodabet[ch] != -1;
    }