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OI-codes/Luogu/CF1421A/CF1421A.cpp

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#include <bits/stdc++.h>
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using namespace std;
int main() {
int t, a, b;
cin >> t;
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while (t--) {
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cin >> a >> b;
cout << a + b - (a & b) * 2 << endl;
}
return 0;
}