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 ":".
The
main
stem
of
the
Pit
River
is
long
,
and
some
water
in
the
system
flows
to
the
Sacramento
River
measuring
from
the
Pit
River
's
longest
source
.
The:O
main:O
stem:O
of:O
the:O
Pit:location-bodiesofwater
River:location-bodiesofwater
is:O
long:O
,:O
and:O
some:O
water:O
in:O
the:O
system:O
flows:O
to:O
the:O
Sacramento:location-bodiesofwater
River:location-bodiesofwater
measuring:O
from:O
the:O
Pit:location-bodiesofwater
River:location-bodiesofwater
's:O
longest:O
source:O
.:O