a man walks across the tightrope .
There is a very good chance that a man walks across the tightrope to try not to fall in a pit below .
There is a very good chance that a man walks across the tightrope to try not to fall in a pit below .
It is impossible that a man walks across the tightrope to try not to fall in a pit below .
a man walks across the tightrope to try not to fall in a pit below .