With no explanation, label each line with "person-politician", "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
He
was
invited
to
work
at
the
South
Centre
(
organization
)
,
Geneva
,
by
Julius
Nyerere
,
the
former
President
of
Tanzania
,
and
the
then
Chairman
of
the
group
.
He:O
was:O
invited:O
to:O
work:O
at:O
the:O
South:organization-other
Centre:organization-other
(:O
organization:O
):O
,:O
Geneva:location-GPE
,:O
by:O
Julius:person-politician
Nyerere:person-politician
,:O
the:O
former:O
President:O
of:O
Tanzania:location-GPE
,:O
and:O
the:O
then:O
Chairman:O
of:O
the:O
group:O
.:O