Anchor: In the meantime, until the rules are changed, it would be wise of you to leave a tip or spend more on food.
Entailed: Until the rules change you should spend more money on food 
Contradiction: Don't tip
Contradiction: There are five people playing in the pool.
Contradiction: A lady clown with a balloon plugs her hears.
Contradiction: A boy is in school.
Contradiction: The econometric model stipulated segregated treatment of mail.