/*
* Author : Apu Das Orgho
* Problem : Help them!
* Created on : 27-09-2025
*/
#include<bits/stdc++.h>
#define iamspeed ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl '\n'
using namespace std;
vector<bool> found(1005, 0);
int main() {
iamspeed
int t;
cin >> t;
while (t--) {
int n;
cin >> n;
vector<int> v(n);
int mn = 1005, mx = 0;
for (int i = 0; i < n; i++) {
cin >> v[i];
found[v[i]] = true;
mn = min(mn, v[i]);
mx = max(mx, v[i]);
}
for (int i = mn; i <= mx; i++) {
if (found[i]) {
found[i] = false;
continue;
}
cout << i << endl;
}
}
return 0;
}
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