With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Three
star
systems
have
exoplanets
,
and
a
fourth
planetary
system
is
unconfirmed
.
Three:O
star:O
systems:O
have:O
exoplanets:O
,:O
and:O
a:O
fourth:O
planetary:O
system:O
is:O
unconfirmed:O
.:O