With no explanation, label each line with "location-GPE", "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
1970
Stockholm
Open
was
a
men
's
tennis
tournament
played
on
indoor
hard
courts
and
part
of
the
1970
Pepsi-Cola
Grand
Prix
and
took
place
in
Stockholm
,
Sweden
.
The:O
1970:O
Stockholm:event-sportsevent
Open:event-sportsevent
was:O
a:O
men:O
's:O
tennis:O
tournament:O
played:O
on:O
indoor:O
hard:O
courts:O
and:O
part:O
of:O
the:O
1970:event-sportsevent
Pepsi-Cola:event-sportsevent
Grand:event-sportsevent
Prix:event-sportsevent
and:O
took:O
place:O
in:O
Stockholm:location-GPE
,:O
Sweden:location-GPE
.:O