Anchor: We only ask that they take on one (free) case at a time.
Entailed: The only thing we are asking is that they don't take more than one free case at the same time. 
Contradiction: It's up to them how many free cases they take on at one time.
Contradiction: Two women are baking a pie.
Contradiction: There is a bicyclist and pedestrians in front of a building.
Contradiction: People buying ice cream for their meat loaf.
Contradiction: Three people are washing windows.