@Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Punctuation other = (Punctuation) obj;
        if (!Objects.equals(this.value, other.value)) {
            return false;
        }
        return true;
    }