With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
responsible
for
the
impoundment
of
water
from
the
American
River
to
create
the
Lake
Natoma
reservoir
.
It:O
is:O
responsible:O
for:O
the:O
impoundment:O
of:O
water:O
from:O
the:O
American:location-bodiesofwater
River:location-bodiesofwater
to:O
create:O
the:O
Lake:location-bodiesofwater
Natoma:location-bodiesofwater
reservoir:O
.:O