Anchor: A math professor writes his name on a chalkboard full of equations.
Entailed: A professor is standing in a classroom.
Contradiction: The professor walks out of the class.
Contradiction: GAO's work has led to the development of security holes in the system. 
Contradiction: THey rented out a unit.
Contradiction: There is a cave at the Cueva del Pirata where schools are held.
Contradiction:  He had a raspy voice.