#include<bits/stdc++.h>
using namespace std;

#define Tanjid ios_base::sync_with_stdio(false);
#define the cin.tie(0);
#define OwL cout.tie(0);
#define endl "n"
#define ll long long

void solve() {
    ll n;
    cin >> n;

    vector<ll> arr(n);

    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
    }



    for (int i = 0; i < n - 3; i++) {
        for (int j = i + 1; j < n - 2; j++) {
            for (int k = j + 1; k < n - 1; k++) {
                for (int l = k + 1; l < n; l++) {
                    if ((arr[i] + arr[j]) != (arr[k] + arr[l])) {
                        cout << "YES" << endl;
                        return;
                    }
                }
            }
        }
    }

    cout << "NO" << endl;
}

int main() {
    Tanjid
    the
    OwL
    int T;
    cin >> T;

    while (T--) {
        solve();
    }

    return 0;
}