With no explanation, label each line with "building-other", "O", "location-bodiesofwater", "location-GPE", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
The
construction
of
the
Libby
Dam
on
the
Kootenai
River
in
Montana
and
the
Duncan
Dam
1967
on
the
Duncan
River
,
combined
to
further
reduce
natural
phosphorus
levels
in
the
lake
from
the
recorded
highs
.
The:O
construction:O
of:O
the:O
Libby:building-other
Dam:building-other
on:O
the:O
Kootenai:location-bodiesofwater
River:location-bodiesofwater
in:O
Montana:location-GPE
and:O
the:O
Duncan:building-other
Dam:building-other
1967:O
on:O
the:O
Duncan:location-bodiesofwater
River:location-bodiesofwater
,:O
combined:O
to:O
further:O
reduce:O
natural:O
phosphorus:other-chemicalthing
levels:O
in:O
the:O
lake:O
from:O
the:O
recorded:O
highs:O
.:O