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 ":".
Orion
'
s
seven
brightest
stars
form
a
distinctive
hourglass-shaped
asterism
,
or
pattern
,
in
the
night
sky
.
Orion:other-astronomything
':other-astronomything
s:O
seven:O
brightest:O
stars:O
form:O
a:O
distinctive:O
hourglass-shaped:O
asterism:O
,:O
or:O
pattern:O
,:O
in:O
the:O
night:O
sky:O
.:O