With no explanation, label each line with "O", "building-theater", "art-other", "art-broadcastprogram", "art-film", "art-music", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
By
1928
``
Le
Corsaire
``
had
been
performed
224
times
since
1899
at
the
Mariinsky
Theatre
.
By:O
1928:O
``:O
Le:art-other
Corsaire:art-other
``:O
had:O
been:O
performed:O
224:O
times:O
since:O
1899:O
at:O
the:O
Mariinsky:building-theater
Theatre:building-theater
.:O