With no explanation, label each line with "product-other", "location-GPE", "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Based
on
data
retrieved
by
``
Astron
``
,
the
largest
ultraviolet
space
telescope
of
the
time
,
during
its
Halley
's
Comet
observations
in
December
1985
,
a
group
of
Soviet
scientists
developed
a
model
of
the
comet
's
coma
.
Based:O
on:O
data:O
retrieved:O
by:O
``:O
Astron:product-other
``:O
,:O
the:O
largest:O
ultraviolet:O
space:O
telescope:O
of:O
the:O
time:O
,:O
during:O
its:O
Halley:other-astronomything
's:other-astronomything
Comet:other-astronomything
observations:O
in:O
December:O
1985:O
,:O
a:O
group:O
of:O
Soviet:location-GPE
scientists:O
developed:O
a:O
model:O
of:O
the:O
comet:O
's:O
coma:O
.:O