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 ":".
During
1930s
due
to
mass
repressions
among
specialists
of
cultural
heritage
conservation
and
fall
of
the
cultural
heritage
conservation
system
,
many
reserved
territories
lost
their
reserved
status
.
During:O
1930s:O
due:O
to:O
mass:O
repressions:O
among:O
specialists:O
of:O
cultural:O
heritage:O
conservation:O
and:O
fall:O
of:O
the:O
cultural:O
heritage:O
conservation:O
system:O
,:O
many:O
reserved:O
territories:O
lost:O
their:O
reserved:O
status:O
.:O