#include <iostream>
 
bool eval(bool a,bool b) {
    return (@@@@);
}
 
int main() {
    std::cout << std::noboolalpha;
    std::cout << "|  a  |  b  |  XOR   " << std::endl;
    std::cout << "|  0  |  0  |   " << eval(false, false) << std::endl;
    std::cout << "|  0  |  1  |   " << eval(false, true)  << std::endl;
    std::cout << "|  1  |  0  |   " << eval(true,  false) << std::endl;
    std::cout << "|  1  |  1  |   " << eval(true,  true)  << std::endl;
}