中文说明：该压缩文件分为两个函数，分别用于实现猫脸变换（Arnold变换）及其恢复。
English Description：
The compressed file is divided into two functions, which are used to realize Arnold transformation and its recovery.
The realization of Arnold transform and its recovery
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中文说明：该压缩文件分为两个函数，分别用于实现猫脸变换（Arnold变换）及其恢复。
English Description：
The compressed file is divided into two functions, which are used to realize Arnold transformation and its recovery.