class TwelveDays {
    String verse(int verseNumber) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

    String verses(int startVerse, int endVerse) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }
    
    String sing() {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }
}