With no explanation, label each line with "O", "building-hospital", "building-sportsfacility", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
They
played
their
home
games
at
Duke
Ellington
Field
near
Georgetown
Hospital
.
They:O
played:O
their:O
home:O
games:O
at:O
Duke:building-sportsfacility
Ellington:building-sportsfacility
Field:building-sportsfacility
near:O
Georgetown:building-hospital
Hospital:building-hospital
.:O