With no explanation, label each line with "O", "location-bodiesofwater", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
1901
,
two
additional
locks
and
dams
were
opened
on
the
Green
River
,
which
allowed
river
traffic
to
Mammoth
Cave
.
In:O
1901:O
,:O
two:O
additional:O
locks:O
and:O
dams:O
were:O
opened:O
on:O
the:O
Green:location-bodiesofwater
River:location-bodiesofwater
,:O
which:O
allowed:O
river:O
traffic:O
to:O
Mammoth:location-other
Cave:location-other
.:O