Anchor: Two children stand on very old stairs.
Entailed: Two children are standing.
Contradiction: The kids are sitting at the table.
Contradiction: He works in the light and absolutely trusts everyone. 
Contradiction: The old man is at work.
Contradiction: Considering the case of Frank McCourt, one can not wonder whether teachers can measure their own progress or not. 
Contradiction: Two teams are playing a soccer match.