With no explanation, label each line with "O", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Knox
Mine
Disaster
was
the
final
blow
to
the
industry
.
The:event-disaster
Knox:event-disaster
Mine:event-disaster
Disaster:event-disaster
was:O
the:O
final:O
blow:O
to:O
the:O
industry:O
.:O