Stone fence section, stretch to desired length. Place multiple fence sections end-to-end.
石围墙段，可任意拉伸到所需的长度。将多个防护网段首尾相连。
youdao
And also to find string whose length is multiple of 5.
并找到字符串的长度是5的倍数。
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模块上移
模块下移
不移动