Dennis was educated at University College School in London.

Entity and relation annotations:
id: 0
type: entity
value: text: Dennis
labels: <Person>
id: 1
type: entity
value: text: University College School
labels: <Organization>
id: 2
type: entity
value: text: London
labels: <Location>
type: relation
to_id: 1
labels: Person:affiliated_with:Organization
from_id: 0
type: relation
to_id: 2
labels: Organization:located_in:Location
from_id: 1