With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
reactor
is
still
operating
at
Chalk
River
where
it
is
used
for
reactor
physics
and
nuclear
fuel
research
.
The:O
reactor:O
is:O
still:O
operating:O
at:O
Chalk:location-bodiesofwater
River:location-bodiesofwater
where:O
it:O
is:O
used:O
for:O
reactor:O
physics:O
and:O
nuclear:O
fuel:O
research:O
.:O