Text: In-office refers to the in the office activity of a letter carrier (primarily sequencing mail to be delivered), out-of-office refers to the activity of the carrier while on the street.
Entailment: A letter carrier's in-office activity mainly refers to sorting mail, while their out-of-office activities refer to their activities while on the street.
Contradiction: A letter carrier's in-office activity includes sorting and delivering mail during regular service.