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 ":".
In
late
1941
,
Las
Vegas
Army
Airfield
was
established
.
In:O
late:O
1941:O
,:O
Las:building-airport
Vegas:building-airport
Army:building-airport
Airfield:building-airport
was:O
established:O
.:O