Anchor: Two surfers catch the same huge wave in the ocean.
Entailed: Two people are surfing the same wave.
Contradiction: The people are on a boat.
Contradiction: Their marriage took place before he entered his first year of law school.
Contradiction: New arrivals to the site are welcome.
Contradiction: The restaurant does not offer many vegetarian options, but is still open in the mornings for those who want meat.
Contradiction: She'd put a lot of thought into writing the letter.