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 ":".
The
fossil
remains
were
recovered
in
a
series
of
expeditions
during
a
period
spanning
the
years
1999
and
2000
and
were
described
by
J.D
.
The:O
fossil:O
remains:O
were:O
recovered:O
in:O
a:O
series:O
of:O
expeditions:O
during:O
a:O
period:O
spanning:O
the:O
years:O
1999:O
and:O
2000:O
and:O
were:O
described:O
by:O
J.D:O
.:O