Anchor: i don't i'm a graduate student i'm a professional student
Entailed: I'm a professional student.
Contradiction: I am no longer a student. 
Contradiction: People are riding bikes down the street.
Contradiction: For him, her and the chair, the evening became more annoying each time.
Contradiction: People are dancing at a club.
Contradiction: A man jumps in the air on a snowboard.