Please trace (C++)

8 int main() 9 { 10 int a = 5, b = 5, 11 c = 3, d = 7; 12 13 cout << a-- << ' '; 14 cout << a << ' '; 15 cout << a-- << ' ' << a-- << ' '; 16 cout << a-- << ' ' << a << endl; 17 18 cout << ++b << ' '; 19 cout << b << ' '; 20 cout << ++b << ' ' << ++b << ' '; 21 cout << ++b << ' ' << b << endl; 22 23 a = c++ * d--; 24 cout << a << " " << c << ' ' << d << endl; 25 26 return 0; 27 }