With no explanation, label each line with "O", "event-protest", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
was
the
chairman
and
one
of
the
key
organizers
of
the
August
1963
March
on
Washington
for
Jobs
and
Freedom
.
He:O
was:O
the:O
chairman:O
and:O
one:O
of:O
the:O
key:O
organizers:O
of:O
the:O
August:O
1963:O
March:O
on:O
Washington:event-protest
for:event-protest
Jobs:event-protest
and:event-protest
Freedom:event-protest
.:O