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 ":".
Most
of
O2
plans
are
available
both
in
a
pre-
and
post-paid
version
,
including
the
all-in-one-flatrates
called
``
o2
o
''
and
``
o2
on
''
for
enterprise
customers
.
Most:O
of:O
O2:O
plans:O
are:O
available:O
both:O
in:O
a:O
pre-:O
and:O
post-paid:O
version:O
,:O
including:O
the:O
all-in-one-flatrates:O
called:O
``:O
o2:O
o:O
'':O
and:O
``:O
o2:O
on:O
'':O
for:O
enterprise:O
customers:O
.:O