a woman in a brown dress looking at papers in front of a class.
A woman in a brown dress is a murderous clown at a birthday party.
It would be unusual for a woman to be in front of a class if she is at a birthday party.
The woman is either looking at papers in front of a class or she is a murderous clown at a birthday party.
woman can't be at a birthday party if she is in front of a class