With no explanation, label each line with "building-other", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
the
late
1990s
,
historian
Stephen
Ambrose
suggested
removing
Black
Eagle
Dam
to
restore
the
falls
to
their
original
condition
.
In:O
the:O
late:O
1990s:O
,:O
historian:O
Stephen:person-other
Ambrose:person-other
suggested:O
removing:O
Black:building-other
Eagle:building-other
Dam:building-other
to:O
restore:O
the:O
falls:O
to:O
their:O
original:O
condition:O
.:O