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 ":".
The
Chernobyl
accident
was
the
only
one
to
cause
immediate
deaths
.
The:O
Chernobyl:O
accident:O
was:O
the:O
only:O
one:O
to:O
cause:O
immediate:O
deaths:O
.:O