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 ":".
No
conclusive
studies
have
been
carried
out
on
the
chemical
substances
present
in
this
broad
family
.
No:O
conclusive:O
studies:O
have:O
been:O
carried:O
out:O
on:O
the:O
chemical:O
substances:O
present:O
in:O
this:O
broad:O
family:O
.:O