Anchor: oh isn't it though i don't know why i do it
Entailed: I do it but I'm not sure why. 
Contradiction: No, it isn't, and I know exactly why I always do it.
Contradiction: A woman is empty handed.
Contradiction: person surfs
Contradiction: A man uses a lawnmower to prepare the ski slope.
Contradiction: A person is wearing blue jeans.