#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <fstream>
#include <string>
#include <set>
#include <deque>
#include <queue>
#include <map>
#include <bitset>
#include <random>
#include <cassert>
#include <unordered_map>
#include <unordered_set>
using namespace std;
typedef long long              ll;
typedef unsigned long long     ull;
typedef long double            ld;
#define sqrt              sqrtl
#define endl              "\n"
#define all(a)            a.begin(), a.end()
#define allr(a)           a.rbegin(), a.rend()
#define pb                push_back
#define F                 first
#define S                 second
//3
//4
//4 4 4 4
//0
//4
//1 2 4 4
//1
void solve() {
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ll t = 1;
    cin >> t;
    //ll iff = 0;
    //1 1 2 1 4 4 1
    while (t--) {
        ll n;
        cin >> n;
        vector<vector<ll>>dp(n, vector<ll>(201,0));
        vector<ll>a(n);
        for (ll i = 0; i < n; i++)
            cin >> a[i];
        ll cur = 200;
        dp[0][a[0]]++;
        ll count = 0;
        for (ll i = 1; i < n; i++) {
            for (ll j = 1; j <= cur; j++) {
                dp[i][j] = dp[i - 1][j] + (a[i] == j);
            }
        }
        for (ll i = 1; i <= cur; i++) {
            if (dp[n - 1][i])
                count++;
        }
        if (count == n) {
            cout << 1 << endl;
            continue;
        }
        if (count == 1) {
            for (ll i = 1; 1 <= cur; i++) {
                if (dp[n - 1][i]) {
                    //cout << "case #" << iff << ' ';
                    cout << dp[n - 1][i] << endl;
                    //iff++;
                    break;
                }
            }
            continue;
        }
        else if (count == 2) {
            ll cnt = 0;
            ll loll = -1;
            for (ll i = 1; i < n; i++) {
                if (a[i] != a[i - 1]) {
                    cnt++;
                    loll = max(dp[n - 1][a[i]], dp[n - 1][a[i - 1]]);
                    i ++;
                }
            }
            if (cnt == 1) {
                //cout << "case #" << iff<<' ';
                cout<<  loll << endl;
                //iff++;
                continue;
            }
        }
        ll mx = -1;
        for (ll i = 0; i < n; i++) {
            for (ll j = 1; j <= cur; j++) {
                ll check = dp[n - 1][j] - 2 * dp[i][j];
                if (dp[n - 1][j] - 2 * dp[i][j] >= 0) {
                    ll l = i, r = n;
                    while (r - l > 1) {
                        ll mid = (r + l) / 2;
                        if (dp[mid][j] - 2*dp[i][j] >= 0) {
                            r = mid;
                        }
                        else l = mid;
                    }
                    ll mex = -1;
                    for (ll f = 1; f <= cur; f++) {
                        if(f!=j)
                        mex = max(dp[l][f] - dp[i][f], mex);
                    }
                    mx = max(mex + 2 * dp[i][j], mx);
                }
            }
        }
        //cout << "case #" << iff << ' ';
        cout << mx << endl;
       // iff++;
    }
}