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| #include <bits/stdc++.h>
using namespace std;
const double eps = 1e-10;
const double pi = 3.1415926535897932384626433832795;
const double eln = 2.718281828459045235360287471352;
#define f(i, a, b) for (int i = a; i <= b; i++)
#define scan(x) scanf("%d", &x)
#define mp make_pair
#define pb push_back
#define lowbit(x) (x&(-x))
#define fi first
#define se second
#define SZ(x) int((x).size())
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define summ(a) (accumulate(all(a), 0ll))
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef vector<int> vi;
using ll=long long;
ll tt,n,a[(int)1e5+9],b[(int)1e5+9];
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>tt;
f(sb,1,tt){
cin>>n;
f(i,1,n)cin>>a[i];
f(i,1,n)cin>>b[i];
auto check=[&](ll val){
vector<ll> x,y;
f(i,1,n)x.push_back(a[i]&val),y.push_back(~b[i]&val);
sort(all(x)),sort(all(y));
return x==y;
};
ll ans=0;
for(int i=29;~i;--i){
if(check(ans|(1ll<<i))){
ans|=(1ll<<i);
}
}
cout<<ans<<"\n";
}
return 0;
}
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