With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
After
the
Native
Americans
were
driven
out
and
west
,
the
land
was
opened
to
settlement
by
Anglo-Americans
.
After:O
the:O
Native:O
Americans:O
were:O
driven:O
out:O
and:O
west:O
,:O
the:O
land:O
was:O
opened:O
to:O
settlement:O
by:O
Anglo-Americans:O
.:O