With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
destroyed
in
1941
during
a
Second
World
War
air
raid
.
It:O
was:O
destroyed:O
in:O
1941:O
during:O
a:O
Second:event-attack/battle/war/militaryconflict
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
air:O
raid:O
.:O