With no explanation, label each line with "O", "organization-company", "person-athlete", "location-GPE", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
She
was
then
moved
up
to
Group
Three
class
for
the
May
Hill
Stakes
at
Doncaster
and
was
ridden
to
victory
by
the
veteran
Joe
Mercer
at
odds
of
4/6
.
She:O
was:O
then:O
moved:O
up:O
to:O
Group:event-sportsevent
Three:event-sportsevent
class:O
for:O
the:O
May:organization-company
Hill:organization-company
Stakes:organization-company
at:O
Doncaster:location-GPE
and:O
was:O
ridden:O
to:O
victory:O
by:O
the:O
veteran:O
Joe:person-athlete
Mercer:person-athlete
at:O
odds:O
of:O
4/6:O
.:O