Anchor: This means collecting the mail and sorting it either by hand or on a sorting machine.
Entailed: The mail can be sorted by hand or in a machine. 
Contradiction: The only way to sort the mail is by hand. 
Contradiction: A woman knits a cap.
Contradiction: A crowd of people and picnic tables.
Contradiction: The kids are inside the school for detention.
Contradiction: Two girls are working with wood.