num2

#include <iostream>
using namespace std;

int main() {
    for (int w = 0; w < 2; w++) {
        for (int x = 0; x < 2; x++) {
            for (int y = 0; y < 2; y++) {
                for (int z = 0; z < 2; z++) {
                    if (((x || y) && !(y == z) && !w)
                        && w + x + y +z == 2 || w + x + y +z == 1)
                        cout << "w = " << w << " x = "<< x << " y = " << y
                            << " z = " << z << endl;
                }
            }
        }
    }
    return 0;
}