With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Barium
is
becoming
more
popular
to
be
used
a
base
for
palaeoceanographic
proxies
.
Barium:other-chemicalthing
is:O
becoming:O
more:O
popular:O
to:O
be:O
used:O
a:O
base:O
for:O
palaeoceanographic:other-chemicalthing
proxies:other-chemicalthing
.:O