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
current
black
body
temperature
of
the
background
radiation
is
about
.
The:O
current:O
black:O
body:O
temperature:O
of:O
the:O
background:O
radiation:O
is:O
about:O
.:O