Anchor: A skateboarder goes down some stairs.
Entailed: The skateboarder uses the stairs.
Contradiction: The skateboarder wipes out.
Contradiction: The size of your class does not determine whether or not you have to do it.
Contradiction: A system needs to perform its required functions.
Contradiction: The varsity quarterback devours a steak, urged on by friends.
Contradiction: Only some of them get help from the office.