Anchor: You might not find the signed first edition of your dreams.
Entailed: It's possible that you won't find the signed first edition you've been dreaming about.
Contradiction: You are guaranteed to find the signed first edition you want.
Contradiction: It's dangerous to walk on the beach during the day, but very safe at night.
Contradiction: A girl rides her bike.
Contradiction: A dog is wearing a purple sweater.
Contradiction: Do you believe you can do it?