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
study
time
is
therefore
one
to
two
semesters
shorter
.
The:O
study:O
time:O
is:O
therefore:O
one:O
to:O
two:O
semesters:O
shorter:O
.:O