Anchor: A dirt bike rider jumps in the air.
Entailed: Someone is riding a dirt bike
Contradiction: The rider is on the ground
Contradiction: I hated the way his voice sounded.
Contradiction: The briefing described the case study design choices.
Contradiction: There is no correlation between PM exposure and mortality rates. 
Contradiction: The Collegio del Cambio is on Corso Vannucci street.