With no explanation, label each line with "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Excavation
of
the
settlement
on
the
summit
of
Mont
Lassois
revealed
extensive
fortifications
,
with
ditches
and
walls
up
to
8
m
thick
.
Excavation:O
of:O
the:O
settlement:O
on:O
the:O
summit:O
of:O
Mont:location-mountain
Lassois:location-mountain
revealed:O
extensive:O
fortifications:O
,:O
with:O
ditches:O
and:O
walls:O
up:O
to:O
8:O
m:O
thick:O
.:O