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 ":".
Ancient
Chinese
,
Greek
,
Roman
and
Hunnic
armies
employed
military
machines
and
inventions
such
as
artillery
which
was
developed
by
the
Greeks
around
the
4th
century
BC
,
the
trireme
,
the
ballista
and
the
catapult
.
Ancient:O
Chinese:location-GPE
,:O
Greek:location-GPE
,:O
Roman:location-GPE
and:O
Hunnic:location-GPE
armies:O
employed:O
military:O
machines:O
and:O
inventions:O
such:O
as:O
artillery:O
which:O
was:O
developed:O
by:O
the:O
Greeks:O
around:O
the:O
4th:O
century:O
BC:O
,:O
the:O
trireme:O
,:O
the:O
ballista:O
and:O
the:O
catapult:O
.:O