With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
served
as
a
founding
chairman
of
the
1963
March
on
Washington
and
spoke
at
that
event
.
He:O
served:O
as:O
a:O
founding:O
chairman:O
of:O
the:O
1963:O
March:O
on:O
Washington:location-GPE
and:O
spoke:O
at:O
that:O
event:O
.:O