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 ":".
Until
1992
Ypenburg
was
a
military
airfield
known
as
Ypenburg
Airport
.
Until:O
1992:O
Ypenburg:building-airport
was:O
a:O
military:O
airfield:O
known:O
as:O
Ypenburg:building-airport
Airport:building-airport
.:O