A female martial arts student demonstrates with a weapon while others watch .
It is impossible that a martial arts student is practicing with nun-chuks in front of an audience .
It is impossible that a martial arts student is practicing with nun-chuks in front of an audience .
It is probably the case that a martial arts student is practicing with nun-chuks in front of an audience .
A martial arts student is practicing with nun-chuks in front of an audience .