With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
system
was
in
1991
a
test
case
for
the
Zeta
Herculis
moving
group
,
of
low
metallicity
stars
with
5
billion
years
of
age
.
This:O
system:O
was:O
in:O
1991:O
a:O
test:O
case:O
for:O
the:O
Zeta:other-astronomything
Herculis:other-astronomything
moving:O
group:O
,:O
of:O
low:O
metallicity:O
stars:O
with:O
5:O
billion:O
years:O
of:O
age:O
.:O