With no explanation, label each line with "O", "event-protest", "organization-other", "person-politician", "location-GPE", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
King
and
his
followers
were
finally
able
to
commence
the
nonviolent
march
on
March
21
,
accompanied
by
nearly
4,000
U.S
.
Army
and
Alabama
National
Guard
soldiers
under
federal
orders
from
President
Johnson
.
King:O
and:O
his:O
followers:O
were:O
finally:O
able:O
to:O
commence:O
the:event-protest
nonviolent:event-protest
march:event-protest
on:O
March:O
21:O
,:O
accompanied:O
by:O
nearly:O
4,000:O
U.S:location-GPE
.:location-GPE
Army:O
and:O
Alabama:organization-other
National:organization-other
Guard:organization-other
soldiers:O
under:O
federal:O
orders:O
from:O
President:O
Johnson:person-politician
.:O