#include<bits/stdc++.h>
using namespace std;
int a[50005];
map<int, bool> mp;
int main()
{
	int t, n;
	cin >> t;
	for(int i = 1; i <= t; i ++)
	{
		cin >> n;
		for(int j = 1; j <= n; j ++)
		{
			cin >> a[j];
			mp[a[j]] = true;
		}
		for(int j = 1; j <= n; j ++)
			if(mp[a[j]] = true)
			{
				cout << a[i] << " ";
				mp[a[j]] = false;
			}
	}
	return 0;
}