While at Vostok, Opportunity investigated a rock dubbed "Gagarin", named for cosmonaut Yuri Gagarin.

Entity and relation annotations:
id: 0
type: entity
value: text: Yuri Gagarin
labels: <Person>
id: 1
type: entity
value: text: Vostok
labels: <Location>
id: 2
type: entity
value: text: Opportunity
labels: <Production>
id: 3
type: entity
value: text: cosmonaut
labels: <Title>
type: relation
to_id: 3
labels: Person:holds_title:Title
from_id: 0