#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod = 10007, MOD = 10009;
int T, n, d, a1[12340567], a2[12304567];

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> T;
	for (int i = 1; i <= T; i++) {
		cin >> n;
		for (int j = 1; j <= n; j++) {
			cin >> d;
			if (a1[d % mod] != i || a2[d % MOD] != i) {
				a1[d % mod] = i;
				a2[d % MOD] = i;
				cout << d << " ";
			}
		}
		cout << endl;
	}
	return 0;
}