With no explanation, label each line with "location-GPE", "O", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Because
of
its
increasing
popularity
with
young
party
goers
in
Beijing
,
Shanghai
,
Nanjing
,
Guangzhou
,
and
Shenzhen
,
Chinese
law
enforcement
officials
report
significant
increases
in
the
domestic
production
of
MDMA
(
``
Ecstasy
``
)
.
Because:O
of:O
its:O
increasing:O
popularity:O
with:O
young:other-medical
party:other-medical
goers:other-medical
in:O
Beijing:location-GPE
,:O
Shanghai:location-GPE
,:O
Nanjing:location-GPE
,:O
Guangzhou:location-GPE
,:O
and:O
Shenzhen:location-GPE
,:O
Chinese:location-GPE
law:O
enforcement:O
officials:O
report:O
significant:O
increases:O
in:O
the:O
domestic:O
production:O
of:O
MDMA:other-medical
(:O
``:O
Ecstasy:other-medical
``:O
):O
.:O