With no explanation, label each line with "location-GPE", "O", "building-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Soviet
engineers
took
part
in
the
construction
of
the
Yongbyon
Nuclear
Scientific
Research
Center
and
began
construction
of
an
IRT-2000
research
reactor
in
1963
,
which
became
operational
in
1965
and
was
upgraded
to
8
MW
in
1974
.
Soviet:location-GPE
engineers:O
took:O
part:O
in:O
the:O
construction:O
of:O
the:O
Yongbyon:building-other
Nuclear:building-other
Scientific:building-other
Research:building-other
Center:building-other
and:O
began:O
construction:O
of:O
an:O
IRT-2000:O
research:O
reactor:O
in:O
1963:O
,:O
which:O
became:O
operational:O
in:O
1965:O
and:O
was:O
upgraded:O
to:O
8:O
MW:O
in:O
1974:O
.:O