A woman is standing in a rough hewn structure with a round opening with her head sticking out above the opening .
It is certain that a woman sticks her head up from an opening to get fresh air .
Chances are about even that a woman sticks her head up from an opening to get fresh air .
It is certain that a woman sticks her head up from an opening to get fresh air .
A woman sticks her head up from an opening to get fresh air .