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 ":".
They
could
be
a
great
coupling
–
but
it
would
turn
into
a
nightmare
if
they
both
fell
off
the
wagon
.
''
They:O
could:O
be:O
a:O
great:O
coupling:O
–:O
but:O
it:O
would:O
turn:O
into:O
a:O
nightmare:O
if:O
they:O
both:O
fell:O
off:O
the:O
wagon:O
.:O
'':O