With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
One
part
of
the
trail
was
in
a
heavily
wooded
area
with
a
deep
ravine
on
either
side
;
there
the
Seneca
warriors
attacked
the
wagon
train
.
One:O
part:O
of:O
the:O
trail:O
was:O
in:O
a:O
heavily:O
wooded:O
area:O
with:O
a:O
deep:O
ravine:O
on:O
either:O
side:O
;:O
there:O
the:O
Seneca:organization-other
warriors:O
attacked:O
the:O
wagon:O
train:O
.:O