for i in range(int(input())):
a=int(input())
l=list(map(int,input().split(' ')))
b=len(set(l))
for j in range(a):
if j<b:
print(b,end=" ")
else:
print(b+1,end=" ")
b+=1#include<bits/stdc++.h>
using namespace std;
int main()
{
long long int a, b, c, i, j, k, m, n, o, l, r, f = 0, cnt = 0, sum = 0, total = 0, mn = INT_MAX, mx = INT_MIN, sz, len, temp, pos, tc, x, y, z, arr[300010];
vector<long long int> vrr;
string s;
cin>>tc;
while(tc--)
{
cin>>n;
set<int>st;
for( i = 1; i <= n; i++ )
{
cin>>arr[i];
st.insert(arr[i]);
}
a = st.size();
for( i = 1; i<= n; i++ )
{
if( i <= a )
{
cout<< a << " ";
}
else cout<< i << " ";
}
cout<< endl;
}
}
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