With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
the
early
1980s
,
the
airfield
was
one
of
the
reserve
landing
sites
for
the
reusable
low
Earth
orbital
spacecraft
system
Buran
.
In:O
the:O
early:O
1980s:O
,:O
the:O
airfield:O
was:O
one:O
of:O
the:O
reserve:O
landing:O
sites:O
for:O
the:O
reusable:O
low:O
Earth:O
orbital:O
spacecraft:O
system:O
Buran:product-other
.:O