#include <iostream> using namespace std; int main() { for (int q = 1; q<=9; q++) { for (int j = 0; j <=9; j++) { for (int y = 0; y<=9; y++) { for (int r = 0; r<=9; r++) { if (q==j || q== y || q== r || j== y|| j== r || y== r) { cout << endl <<""; } else {cout <<endl<<q<<j<<y<<r<<endl;} } } } } }