With no explanation, label each line with "O", "person-artist/author", "person-actor", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
opera
was
produced
by
Branko
Gavella
,
choreographed
by
Ana
Roje
and
Oskar
Harmoš
,
and
its
main
role
was
played
by
Srebrenka
Jurinac
.
The:O
opera:O
was:O
produced:O
by:O
Branko:person-artist/author
Gavella:person-artist/author
,:O
choreographed:O
by:O
Ana:person-artist/author
Roje:person-artist/author
and:O
Oskar:person-artist/author
Harmoš:person-artist/author
,:O
and:O
its:O
main:O
role:O
was:O
played:O
by:O
Srebrenka:person-actor
Jurinac:person-actor
.:O