for _ in range(int(input())):
a, b = list(map(int, input().split()))
print(a ^ b)#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin>>t;
while(t--)
{
long long n,m;
cin>>n>>m;
cout<<(n^m)<<endl;
}
}
1615B - And It's Non-Zero | 1619E - MEX and Increments |
34B - Sale | 1436A - Reorder |
1363C - Game On Leaves | 1373C - Pluses and Minuses |
1173B - Nauuo and Chess | 318B - Strings of Power |
1625A - Ancient Civilization | 864A - Fair Game |
1663B - Mike's Sequence | 448A - Rewards |
1622A - Construct a Rectangle | 1620A - Equal or Not Equal |
1517A - Sum of 2050 | 620A - Professor GukiZ's Robot |
1342A - Road To Zero | 1520A - Do Not Be Distracted |
352A - Jeff and Digits | 1327A - Sum of Odd Integers |
1276A - As Simple as One and Two | 812C - Sagheer and Nubian Market |
272A - Dima and Friends | 1352C - K-th Not Divisible by n |
545C - Woodcutters | 1528B - Kavi on Pairing Duty |
339B - Xenia and Ringroad | 189A - Cut Ribbon |
1182A - Filling Shapes | 82A - Double Cola |