With no explanation, label each line with "location-GPE", "O", "person-scholar", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Russell
Leon
Caldwell
was
an
American
historian
,
educator
,
and
community
activist
.
Russell:person-scholar
Leon:person-scholar
Caldwell:person-scholar
was:O
an:O
American:location-GPE
historian:O
,:O
educator:O
,:O
and:O
community:O
activist:O
.:O