Anchor: Many of those mothers were casualties of the '80s crack epidemic.
Entailed: In the 80s a crack epidemic lead to casualties. 
Contradiction: The 80s crack epidemic did include any mothers. 
Contradiction: A herd of buffaloes running through the prairie.
Contradiction: Two old men make music together.
Contradiction: three men sit in a park
Contradiction: To reciprocate, there needs to be some give and take on both sides.