With no explanation, label each line with "O", "organization-politicalparty", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Wálter
Guevara
Arze
and
the
PRA
formally
backed
René
Barrientos
'
presidential
candidacy
in
1966
,
and
the
Authentic
Revolutionary
Party
served
as
part
of
the
governing
coalition
of
parties
until
1969
.
Wálter:person-politician
Guevara:person-politician
Arze:person-politician
and:O
the:O
PRA:organization-politicalparty
formally:O
backed:O
René:person-politician
Barrientos:person-politician
':O
presidential:O
candidacy:O
in:O
1966:O
,:O
and:O
the:O
Authentic:organization-politicalparty
Revolutionary:organization-politicalparty
Party:organization-politicalparty
served:O
as:O
part:O
of:O
the:O
governing:O
coalition:O
of:O
parties:O
until:O
1969:O
.:O