With no explanation, label each line with "location-GPE", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Early
ancient
Roman
swords
were
similar
to
those
of
the
Greeks
,
called
``
xiphe
``
(
plural
;
singular
``
xiphos
``
)
.
Early:O
ancient:O
Roman:location-GPE
swords:O
were:O
similar:O
to:O
those:O
of:O
the:O
Greeks:O
,:O
called:O
``:O
xiphe:product-weapon
``:O
(:O
plural:O
;:O
singular:O
``:O
xiphos:product-weapon
``:O
):O
.:O