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
first
production
order
for
12
aircraft
was
placed
``
off
the
drawing
board
''
(
i.e
.
The:O
first:O
production:O
order:O
for:O
12:O
aircraft:O
was:O
placed:O
``:O
off:O
the:O
drawing:O
board:O
'':O
(:O
i.e:O
.:O