With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Pallas
has
not
been
visited
by
spacecraft
.
Pallas:product-airplane
has:O
not:O
been:O
visited:O
by:O
spacecraft:O
.:O