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 ":".
6822
,
A
Remote
Stellar
System
''
,
identified
15
variable
stars
(
11
of
which
were
Cepheids
)
of
this
galaxy
.
6822:O
,:O
A:O
Remote:O
Stellar:O
System:O
'':O
,:O
identified:O
15:O
variable:O
stars:O
(:O
11:O
of:O
which:O
were:O
Cepheids:other-astronomything
):O
of:O
this:O
galaxy:O
.:O