#include<bits/stdc++.h>
#define ll long long
using namespace std;
typedef vector<long long> vl;
#define all(v) (v).begin(),(v).end()
#define pb push_back
#define tr(v,it) for(auto it=(v).begin();it!=(v).end();it++)
#define mp make_pair
#define REP(i,a,b) for(i=a;i<=b;i++)
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t,n,x;
cin>>t;
while(t--)
{
cin>>n;
vl v;
while(n--)
{
cin>>x;
v.pb(x);
}
for(auto p:v) cout<<p;
cout<<"\n";
}
return 0;
}
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