<ul class="list">
    <li class="a">a</li>
    <li class="b">b</li>
    <p>???</p>
    <li class="c">c</li>
    <li class="d">d</li>
    <li class="e">e</li>
</ul>
li.b ~ li {
    /*b 클래스를 가지는 li 아래 모든 sibling 요소*/
    color:red;
}

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