With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Events
classified
on
the
International
Nuclear
Event
Scale
as
incidents
typically
do
not
release
any
additional
radioactive
substances
into
the
environment
.
Events:O
classified:O
on:O
the:O
International:O
Nuclear:O
Event:O
Scale:O
as:O
incidents:O
typically:O
do:O
not:O
release:O
any:O
additional:O
radioactive:O
substances:O
into:O
the:O
environment:O
.:O