The United States Postal Service operates the Ashburn Post Office.

Entity and relation annotations:
id: 0
type: entity
value: text: The United States
labels: <Location>
id: 1
type: entity
value: text: The United States Postal Service
labels: <Organization>
id: 2
type: entity
value: text: the Ashburn Post Office
labels: <Organization>
type: relation
to_id: 0
labels: Organization:located_in:Location
from_id: 1