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 ":".
The
front
office
was
staffed
mainly
by
friends
and
family
.
The:O
front:O
office:O
was:O
staffed:O
mainly:O
by:O
friends:O
and:O
family:O
.:O