Anchor: There are construction workers on scaffolding working on a building.
Entailed: people work construction
Contradiction: dog jumps off table
Contradiction: A cyclist parks his bike.
Contradiction: Since SO2, NOx and mercury potentiate each other, a unified approach to reducing their levels is more accurate than considering them one by one. 
Contradiction: My friend and I vowed never to discuss politics.
Contradiction: I was used to using my credit card out a lot.