CF1619A.Square String?

A string is called square if it is some string written twice in a row. For example, the strings "aa", "abcabc", "abab" and "baabaa" are square. But the strings "aaa", "abaaab" and "abcdabc" are not square.

For a given string $s$ determine if it is square.

如果一个字符串是由某个字符串连续写两次构成的，则称该字符串为平方串（square string）。例如，字符串 "aa"、"abcabc"、"abab" 和 "baabaa" 都是平方串。但字符串 "aaa"、"abaaab" 和 "abcdabc" 不是平方串。

给定一个字符串 $s$，请判断它是否为平方串。

The first line of input data contains an integer $t$ ($1 \le t \le 100$) —the number of test cases.

This is followed by $t$ lines, each containing a description of one test case. The given strings consist only of lowercase Latin letters and have lengths between $1$ and $100$ inclusive.

输入数据的第一行包含一个整数 $t$（$1 \le t \le 100$），表示测试用例的数量。

接下来是 $t$ 行，每行描述一个测试用例。给定的字符串仅由小写拉丁字母组成，且长度在 $1$ 到 $100$（含）之间。

For each test case, output on a separate line:

• YES if the string in the corresponding test case is square,
• NO otherwise.

You can output YES and NO in any case (for example, strings yEs, yes, Yes and YES will be recognized as a positive response).

对于每个测试用例，在单独一行中输出：

• 如果对应测试用例中的字符串是“平方串”（square），则输出 YES；
• 否则输出 NO。

YES 和 NO 的大小写不限（例如，字符串 yEs、yes、Yes 和 YES 均被视为肯定回答）。