The United States Postal Service operates the Three Rivers Post Office.

Entity and relation annotations:
id: 0
type: entity
value: text: The United States Postal Service
labels: <Organization>
id: 1
type: entity
value: text: the Three Rivers Post Office
labels: <Organization>
type: relation
to_id: 0
labels: Organization:is_subordinate_to:Organization
from_id: 1