Incr> I;
--- Output:
Incr> I;
--- Output: O(1)
Incr> I;
--- Output:
Incr> ;
--- Output:
Incr> I;
--- Output: O(2)
Incr> I;
--- Output:
Incr> ;
--- Output:
Incr> ;
--- Output:
Incr> R;
--- Output:
Incr> I;
--- Output: O(3)
Incr> I;
--- Output:
Incr> R;
--- Output:
Incr> I;
--- Output: O(4)
Incr> I R;
--- Output:
Incr> R I;
--- Output: