With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Over
150
officers
,
mostly
from
the
PVO
,
were
tried
in
court
and
removed
from
their
posts
.
Over:O
150:O
officers:O
,:O
mostly:O
from:O
the:O
PVO:organization-other
,:O
were:O
tried:O
in:O
court:O
and:O
removed:O
from:O
their:O
posts:O
.:O