The only difference between easy and hard versions is constraints.

You are given a sequence a consisting of n positive integers.

Let's define a three blocks palindrome as the sequence, consisting of at most two distinct elements (let these elements are a and b, a can be equal b) and is as follows: [\underbrace{a, a, ..., a}_{x}, \underbrace{b, b, ..., b}_{y}, \underbrace{a, a, ..., a}_{x}]. There x, y are integers greater than or equal to 0. For example, sequences [], [2], [1, 1], [1, 2, 1], [1, 2, 2, 1] and [1, 1, 2, 1, 1] are three block palindromes but [1, 2, 3, 2, 1], [1, 2, 1, 2, 1] and [1, 2] are not.

Your task is to choose the maximum by length subsequence of a that is a three blocks palindrome.

You have to answer t independent test cases.

Recall that the sequence t is a a subsequence of the sequence s if t can be derived from s by removing zero or more elements without changing the order of the remaining elements. For example, if s=[1, 2, 1, 3, 1, 2, 1], then possible subsequences are: [1, 1, 1, 1], [3] and [1, 2, 1, 3, 1, 2, 1], but not [3, 2, 3] and [1, 1, 1, 1, 2].

Input

The first line of the input contains one integer t (1 ≤ t ≤ 2000) — the number of test cases. Then t test cases follow.

The first line of the test case contains one integer n (1 ≤ n ≤ 2000) — the length of a. The second line of the test case contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ 26), where a_i is the i-th element of a. Note that the maximum value of a_i can be up to 26.

It is guaranteed that the sum of n over all test cases does not exceed 2000 (∑ n ≤ 2000).

Output

For each test case, print the answer — the maximum possible length of some subsequence of a that is a three blocks palindrome.

Example

Input


6
8
1 1 2 2 3 2 1 1
3
1 3 3
4
1 10 10 1
1
26
2
2 1
3
1 1 1


Output


7
2
4
1
1
3
import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.InputMismatchException;
import java.util.List;

public class Main implements Runnable {

    private boolean testCases=true;
    private boolean console=false;
    private long MOD = 1000_000_007L;
    private int MAX = 1000_001;

    public void solve() {

        int n=in.ni();
        int[] arr=new int[n];
        for(int i=0;i<n;++i){
            arr[i] = in.ni();
        }

        int[][] cum = new int[n][201];
        ArrayList<Integer> []list = new ArrayList[201];

        for(int i=0;i<201;++i){
            list[i] = new ArrayList<>();
        }

        int ans = 0;

        for(int i=0;i<n;++i){

            list[arr[i]].add(i);
            cum[i][arr[i]]++;

            ans = Math.max(list[arr[i]].size(),ans);

            if(i==0)
                continue;

            for(int j=0;j<201;++j){
                cum[i][j] += cum[i-1][j];
            }
        }

        for(int i=1;i<201;++i){

            if(list[i].size()==0)
                continue;
            int idx1=0,idx2=list[i].size()-1;
            int pos1 = list[i].get(idx1);
            int pos2 = list[i].get(idx2);

            while(pos1<pos2){

                for(int j=1;j<201;++j){
                    int cnt = cum[pos2-1][j]-cum[pos1][j];
                    ans = Math.max(ans,2*(idx1+1)+cnt);
                }

                pos1 = list[i].get(++idx1);
                pos2 = list[i].get(--idx2);;
            }
        }

        out.println(ans);


    }

    /* -------------------- Templates and Input Classes -------------------------------*/

    @Override
    public void run() {
        try {
            init();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        int t= testCases ? in.ni() : 1;
        while (t-->0) {
            solve();
            out.flush();
        }
    }

    private FastInput in;
    private PrintWriter out;
    public static void main(String[] args) throws Exception {
        new Main().run();
//        new Thread(null, new Main(), "Main", 1 << 27).start();
    }
    private void init() throws FileNotFoundException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        try {
            if (!console && System.getProperty("user.name").equals("puneet")) {
                outputStream = new FileOutputStream("/home/puneet/Desktop/output.txt");
                inputStream = new FileInputStream("/home/puneet/Desktop/input.txt");
            }
        } catch (Exception ignored) {
        }
        out = new PrintWriter(outputStream);
        in = new FastInput(inputStream);
    }
    private void maualAssert(int a,int b,int c){
        if(a<b || a>c)
            throw new RuntimeException();
    }
    private void maualAssert(long a,long b,long c){
        if(a<b || a>c)
            throw new RuntimeException();
    }
    private void sort(int[] arr) {
        List<Integer> list = new ArrayList<>();
        for (int object : arr) list.add(object);
        Collections.sort(list);
        for (int i = 0; i < list.size(); ++i) arr[i] = list.get(i);
    }
    private void sort(long[] arr) {
        List<Long> list = new ArrayList<>();
        for (long object : arr) list.add(object);
        Collections.sort(list);
        for (int i = 0; i < list.size(); ++i) arr[i] = list.get(i);
    }
    public long ModPow(long x, long y, long MOD) {
        long res = 1L;
        x = x % MOD;
        while (y >= 1) {
            if ((y & 1) > 0) res = (res * x) % MOD;
            x = (x * x) % MOD;
            y >>= 1;
        }
        return res;
    }
    public int gcd(int a, int b) {
        if (a == 0) return b;
        return gcd(b % a, a);
    }
    public long gcd(long a, long b) {
        if (a == 0) return b;
        return gcd(b % a, a);
    }
    static class FastInput { InputStream obj;
        public FastInput(InputStream obj) {
            this.obj = obj;
        }
        byte inbuffer[] = new byte[1024];
        int lenbuffer = 0, ptrbuffer = 0;
        int readByte() { if (lenbuffer == -1) throw new InputMismatchException();
            if (ptrbuffer >= lenbuffer) { ptrbuffer = 0;
                try { lenbuffer = obj.read(inbuffer);
                } catch (IOException e) { throw new InputMismatchException(); } }
            if (lenbuffer <= 0) return -1;return inbuffer[ptrbuffer++]; }
        String ns() { int b = skip();StringBuilder sb = new StringBuilder();
            while (!(isSpaceChar(b))) // when nextLine, (isSpaceChar(b) && b!=' ')
            { sb.appendCodePoint(b);b = readByte(); }return sb.toString();}
        int ni() {
            int num = 0, b;boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')) ;
            if (b == '-') { minus = true;b = readByte(); }
            while (true) { if (b >= '0' && b <= '9') { num = num * 10 + (b - '0'); } else {
                    return minus ? -num : num; }b = readByte(); }}
        long nl() { long num = 0;int b;boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')) ;
            if (b == '-') { minus = true;b = readByte(); }
            while (true) { if (b >= '0' && b <= '9') { num = num * 10L + (b - '0'); } else {
                    return minus ? -num : num; }b = readByte(); } }
        boolean isSpaceChar(int c) {
            return (!(c >= 33 && c <= 126));
        }
        int skip() { int b;while ((b = readByte()) != -1 && isSpaceChar(b)) ;return b; }
        float nf() {return Float.parseFloat(ns());}
        double nd() {return Double.parseDouble(ns());}
        char nc() {return (char) skip();}
    }

}