史上最强的验证码


下图6个之中哪个不可以从右方的模型折叠出来。


输入“有猫”的字符。


这个……需要放大镜。



这个……我需要显微镜。


你想让我输入什么?



π?让我打3.14?


不同的图形代表不同的字母。

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