Anchor: A group of women competing in roller derby.
Entailed: Some woman are in a roller derby.
Contradiction: Some woman are shopping at the mall.
Contradiction: It cannot ever happen like that. 
Contradiction: A girl has wet hair.
Contradiction: It is believed that if your coin bounces of a turtle's head, you will have misfortune for years.
Contradiction: A child carrying a red sled.