A man wearing a purple shirt is using a syringe in a lab .
A man is eating a hot dog at a ballpark .
A man wearing a purple shirt is using a syringe in a lab.
A man is eating a hot dog at a ballpark.
A man using a syringe in a lab cannot be eating a hot dog at a ballpark.
A man using a syringe in a lab can not be eating a hot dog at a ballpark .