readingList.add(toKatakana(text));
        return readingList;
    }

    /**
     * Converts the input string to Katakana.
     * @param inputStr The input string.
     * @return The Katakana representation of the input string.
     * @throws IOException If an I/O error occurs.
     */
    protected String toKatakana(final String inputStr) throws IOException {