With no explanation, label each line with "location-GPE", "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
the
second
half
of
the
3rd
century
BC
,
the
Boii
allied
with
the
other
Cisalpine
Gauls
and
the
Etruscans
against
Rome
.
In:O
the:O
second:O
half:O
of:O
the:O
3rd:O
century:O
BC:O
,:O
the:O
Boii:O
allied:O
with:O
the:O
other:O
Cisalpine:location-mountain
Gauls:O
and:O
the:O
Etruscans:O
against:O
Rome:location-GPE
.:O