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 ":".
They
dig
,
work
in
the
prep
lab
removing
matrix
from
dinosaur
bones
and
they
learn
molding
and
casting
.
They:O
dig:O
,:O
work:O
in:O
the:O
prep:O
lab:O
removing:O
matrix:O
from:O
dinosaur:O
bones:O
and:O
they:O
learn:O
molding:O
and:O
casting:O
.:O