2カラム ul li 装飾版

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                <ul class="twodesign">
        <li><img src="https://www.s-contigo.com/images/img/regulation/dum_02.jpg" alt="画像" width="519" height="389"></li>
        <li><img src="https://www.s-contigo.com/images/img/regulation/dum_02.jpg" alt="画像" width="519" height="389"></li>
        <li><img src="https://www.s-contigo.com/images/img/regulation/dum_02.jpg" alt="画像" width="519" height="389"></li>
        <li><img src="https://www.s-contigo.com/images/img/regulation/dum_02.jpg" alt="画像" width="519" height="389"></li>
    </ul>