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<h1>列表和格式化</h1><p>下面是无序列表：</p><ul><li>第一项</li><li>第二项</li><li>第三项</li></ul><p>下面是有序列表：</p><ol><li>步骤一</li><li>步骤二</li><li>步骤三</li></ol><p>包含<code>代码片段</code>和<mark>高亮文本</mark>。</p>