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Some people may need to use multiple Wi-Fi extenders, for instance, if your home is large or has dead zones in different areas. But if you do use multiple Wi-Fi extenders, there’s a chance of interference. You may also need to manually connect to the extenders separately, which isn’t always convenient.
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// 易错点2：条件写成`<`而非`<=` → 相同身高的人会被错误保留，导致count统计少
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