With no explanation, label each line with "O", "organization-politicalparty", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Arab
Socialist
Ba'ath
Party
was
the
leading
advocate
of
such
a
union
.
The:O
Arab:organization-politicalparty
Socialist:organization-politicalparty
Ba'ath:organization-politicalparty
Party:organization-politicalparty
was:O
the:O
leading:O
advocate:O
of:O
such:O
a:O
union:O
.:O