With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
earliest
cast-iron
artefacts
date
to
the
5th
century
BC
,
and
were
discovered
by
archaeologists
in
what
is
now
Jiangsu
in
China
.
The:O
earliest:O
cast-iron:O
artefacts:O
date:O
to:O
the:O
5th:O
century:O
BC:O
,:O
and:O
were:O
discovered:O
by:O
archaeologists:O
in:O
what:O
is:O
now:O
Jiangsu:location-GPE
in:O
China:location-GPE
.:O