You want to type the string $s$, consisting of $n$ lowercase Latin letters, using your favorite text editor Notepad#.

Notepad# supports two kinds of operations:

• append any letter to the end of the string;
• copy a continuous substring of an already typed string and paste this substring to the end of the string.

Can you type string $s$ in strictly less than $n$ operations?

Input

The first line contains a single integer $t$ ($1 \le t \le 10^4$) — the number of testcases.

The first line of each testcase contains a single integer $n$ ($1 \le n \le 2 \cdot 10^5$) — the length of the string $s$.

The second line contains a string $s$, consisting of $n$ lowercase Latin letters.

The sum of $n$ doesn't exceed $2 \cdot 10^5$ over all testcases.

Output

For each testcase, print "YES" if you can type string $s$ in strictly less than $n$ operations. Otherwise, print "NO".

见题面 Input 部分

见题面 Output 部分

In the first testcase, you can start with typing "codef" ($5$ operations), then copy "o" ($1$ operation) from an already typed part, then finish with typing "rces" ($4$ operations). That will be $10$ operations, which is not strictly less than $n$. There exist other ways to type "codeforces". However, no matter what you do, you can't do less than $n$ operations.

In the second testcase, you can type "labac" ($5$ operations), then copy "aba" ($1$ operation), finishing the string in $6$ operations.