With no explanation, label each line with "O", "location-other", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Drona
killed
Vrihatkshatra
,
the
ruler
of
Kekaya
and
Dhrishtakethu
,
the
ruler
of
Chedi
.
Drona:person-other
killed:O
Vrihatkshatra:person-other
,:O
the:O
ruler:O
of:O
Kekaya:O
and:O
Dhrishtakethu:person-other
,:O
the:O
ruler:O
of:O
Chedi:location-other
.:O