编辑文件：heading-level-4.svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <path d="M20 13V7h-3l-4 6v2h5v2h2v-2h1v-2h-1zm-2 0h-2.8L18 9v4zm-9-2H5V7H3v10h2v-4h4v4h2V7H9v4z" /> </svg>
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