求翻译：Suffix change: which means you can change all characters to an identical character, from the ith pos to the end. For instance: abcdefg, you can make this operation in character b,maybe you can use d and the result is adddddd, or if you use e the result is aeeeeee or if you use this operation in character c with character f,the result is abfffff.是什么意思？

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