With no explanation, label each line with "location-GPE", "O", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
worst
loss
of
life
in
United
States
history
due
to
a
wildfire
occurred
in
1871
when
the
Peshtigo
Fire
swept
through
Wisconsin
,
killing
more
than
1,500
people
.
The:O
worst:O
loss:O
of:O
life:O
in:O
United:location-GPE
States:location-GPE
history:O
due:O
to:O
a:O
wildfire:O
occurred:O
in:O
1871:O
when:O
the:O
Peshtigo:event-disaster
Fire:event-disaster
swept:O
through:O
Wisconsin:location-GPE
,:O
killing:O
more:O
than:O
1,500:O
people:O
.:O