Anchor: A shirtless man stands in water next to tools on a raft.
Entailed: There's a man with tools.
Contradiction: A fully-clothed man is swimming.
Contradiction: The cost of booster sessions is negligible, so it can be ignored.
Contradiction: The research information which can be found online has thousands of pages. 
Contradiction: the dogs ate birds
Contradiction: There are two boys.