Anchor: Poirot and I sat together, not being required to give evidence. 
Entailed: We sat together since we didn't have to testify.
Contradiction: Poirot testified first and I second.
Contradiction: the group showed off their art projects
Contradiction: A woman walks through a hall.
Contradiction: The artwork on display has nothing to do with Christianity.
Contradiction: The snowboarder is outside.