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 ":".
It
was
part
of
a
popular
cycle
of
operetta
films
during
the
decade
.
It:O
was:O
part:O
of:O
a:O
popular:O
cycle:O
of:O
operetta:O
films:O
during:O
the:O
decade:O
.:O