With no explanation, label each line with "O", "location-road/railway/highway/transit", "person-politician", "location-GPE", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
Mercer
opened
a
grocery
store
on
Princes
Street
in
Dunedin
,
in
partnership
with
George
Ross
,
and
then
alone
,
and
then
with
his
son
Hector
.
Mercer:person-politician
opened:O
a:O
grocery:O
store:O
on:O
Princes:location-road/railway/highway/transit
Street:location-road/railway/highway/transit
in:O
Dunedin:location-GPE
,:O
in:O
partnership:O
with:O
George:person-other
Ross:person-other
,:O
and:O
then:O
alone:O
,:O
and:O
then:O
with:O
his:O
son:O
Hector:person-other
.:O