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 ":".
Studies
have
suggested
that
the
object
appears
to
be
man-made
.
Studies:O
have:O
suggested:O
that:O
the:O
object:O
appears:O
to:O
be:O
man-made:O
.:O