With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Author
,
environmentalist
,
and
advocate
for
the
protection
of
wilderness
,
for
more
than
thirty
years
he
served
as
a
wilderness
guide
in
the
lakes
and
forests
of
the
Quetico-Superior
country
of
northern
Minnesota
and
southwestern
Ontario
.
Author:O
,:O
environmentalist:O
,:O
and:O
advocate:O
for:O
the:O
protection:O
of:O
wilderness:O
,:O
for:O
more:O
than:O
thirty:O
years:O
he:O
served:O
as:O
a:O
wilderness:O
guide:O
in:O
the:O
lakes:O
and:O
forests:O
of:O
the:O
Quetico-Superior:location-GPE
country:O
of:O
northern:O
Minnesota:location-GPE
and:O
southwestern:O
Ontario:location-GPE
.:O