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<li><code>s1 = "Hello Jane"</code> 与 <code>s2 = "Hello my name is Jane"</code>,我们可以往 <code>s1</code> 中 <code>"Hello"</code> 和 <code>"Jane"</code> 之间插入 <code>"my name is"</code> 得到 <code>s2</code> 。</li>
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<li><code>s1 = "Frog cool"</code> 与 <code>s2 = "Frogs are cool"</code> 不是相似的,因为尽管往 <code>s1</code> 中插入 <code>"s are"</code>,它没有与 <code>"Frog"</code> 用空格隔开。</li>
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