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 ":".
There
were
more
than
six
hundred
aircraft
on
the
field
.
There:O
were:O
more:O
than:O
six:O
hundred:O
aircraft:O
on:O
the:O
field:O
.:O