#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;
}
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