B

#include<bits/stdc++.h>
using namespace std;

int main(){
   int t;
   cin>>t;
   while (t--){
        long long x,y;
        cin>>x>>y;
        vector<long long> v1,v2;
        do {
            v1.push_back(x%2);
            x/=2;
        } while (x);

        do {
            v2.push_back(y%2);
            y/=2;
        } while(y);

        while (v1.size()<v2.size()) v1.push_back(0);
        while (v1.size()>v2.size()) v2.push_back(0);

        long long res=1;
        for (int i=0; i<v1.size(); i++)
        if (v1[i]==v2[i])
            res=(long long)res*2;
        else
            break;

        cout<<res<<"\n";
   }
}