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 ":".
Not
much
is
known
about
him
.
Not:O
much:O
is:O
known:O
about:O
him:O
.:O