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
episode
is
sometimes
billed
as
a
Christmas
special
,
although
the
episode
contains
nothing
Christmas
related
.
The:O
episode:O
is:O
sometimes:O
billed:O
as:O
a:O
Christmas:O
special:O
,:O
although:O
the:O
episode:O
contains:O
nothing:O
Christmas:O
related:O
.:O