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 ":".
Half
of
participants
completed
two
values
essays
in
the
two
weeks
leading
up
to
their
midterm
examination
.
Half:O
of:O
participants:O
completed:O
two:O
values:O
essays:O
in:O
the:O
two:O
weeks:O
leading:O
up:O
to:O
their:O
midterm:O
examination:O
.:O