With no explanation, label each line with "building-other", "O", "product-other", "location-bodiesofwater", "location-GPE", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
Subsequently
,
the
top-secret
Chalk
River
Laboratories
nuclear
research
facility
was
built
at
Chalk
River
,
Ontario
,
and
it
was
here
that
the
ZEEP
atomic
pile
went
critical
in
1945
,
making
Canada
the
second
country
in
the
world
after
the
US
to
build
a
nuclear
reactor
.
Subsequently:O
,:O
the:O
top-secret:O
Chalk:building-other
River:building-other
Laboratories:building-other
nuclear:O
research:O
facility:O
was:O
built:O
at:O
Chalk:location-bodiesofwater
River:location-bodiesofwater
,:O
Ontario:location-GPE
,:O
and:O
it:O
was:O
here:O
that:O
the:O
ZEEP:product-other
atomic:product-other
pile:product-other
went:O
critical:O
in:O
1945:O
,:O
making:O
Canada:location-GPE
the:O
second:O
country:O
in:O
the:O
world:O
after:O
the:O
US:location-GPE
to:O
build:O
a:O
nuclear:O
reactor:O
.:O