With no explanation, label each line with "O", "location-bodiesofwater", "location-park", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Voyageurs
National
Park
maintains
an
extensive
network
of
46
boat-in
camping
sites
on
Rainy
Lake
,
in
addition
to
hiking
trails
and
designated
snowmobile
trails
for
winter
use
.
Voyageurs:location-park
National:location-park
Park:location-park
maintains:O
an:O
extensive:O
network:O
of:O
46:O
boat-in:O
camping:O
sites:O
on:O
Rainy:location-bodiesofwater
Lake:location-bodiesofwater
,:O
in:O
addition:O
to:O
hiking:O
trails:O
and:O
designated:O
snowmobile:O
trails:O
for:O
winter:O
use:O
.:O