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 ":".
Officially
those
informants
were
referred
to
as
secret
coworker
(
,
sekretny
sotrudnik
)
and
often
were
referred
by
a
Russian
derived
portmanteau
seksot
.
Officially:O
those:O
informants:O
were:O
referred:O
to:O
as:O
secret:O
coworker:O
(:O
,:O
sekretny:O
sotrudnik:O
):O
and:O
often:O
were:O
referred:O
by:O
a:O
Russian:O
derived:O
portmanteau:O
seksot:O
.:O