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 ":".
This
number
is
reasonably
well
defined
,
because
it
is
known
what
stars
are
and
what
the
observable
universe
is
,
but
its
value
is
highly
uncertain
.
This:O
number:O
is:O
reasonably:O
well:O
defined:O
,:O
because:O
it:O
is:O
known:O
what:O
stars:O
are:O
and:O
what:O
the:O
observable:O
universe:O
is:O
,:O
but:O
its:O
value:O
is:O
highly:O
uncertain:O
.:O