Anchor: Rooms are comfortable, if a tad gloomy.
Entailed: The rooms are a little gloomy, but they are comfortable.
Contradiction: The rooms are uncomfortable and very upbeat.
Contradiction: Two children are swimming in the ocean.
Contradiction: A man is walking their dog.
Contradiction: Undercurrents are something that swimmers don't need to worry about.
Contradiction: There are a lot of oil spills there.