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 ":".
During
his
wait
for
a
supernova
to
explode
,
he
put
signs
on
some
of
his
large
neutrino
detectors
,
calling
them
``
Supernova
Early
Warning
Systems
''
.
During:O
his:O
wait:O
for:O
a:O
supernova:O
to:O
explode:O
,:O
he:O
put:O
signs:O
on:O
some:O
of:O
his:O
large:O
neutrino:O
detectors:O
,:O
calling:O
them:O
``:O
Supernova:O
Early:O
Warning:O
Systems:O
'':O
.:O