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 ":".
Seven
star
systems
are
known
to
host
planets
.
Seven:O
star:O
systems:O
are:O
known:O
to:O
host:O
planets:O
.:O