With no explanation, label each line with "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-hospital" or "building-hotel" preceded by ":".
This
was
developed
as
an
airport
,
which
is
now
Danbury
Municipal
Airport
.
This:O
was:O
developed:O
as:O
an:O
airport:O
,:O
which:O
is:O
now:O
Danbury:building-airport
Municipal:building-airport
Airport:building-airport
.:O