[EXPLODING BRAIN]

[1]
cout << a << b << endl;

[3]
cout << a + b << endl;

[3]
c = a + b;
cout << c << endl;

[4]
d = b + "";
c = a + "";
cout << c << d << endl;

[5]
d = b + "";
c = a + "";
e = c + d;
cout << e << endl;

[6]
a = "a";
b = "b";
c = pl;
d = pl;
c = a;
d = b;
e = c + d;
cout << a << b << endl;