With no explanation, label each line with "O", "building-theater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
His
plays
were
staged
at
various
theatres
,
including
Nationaltheatret
,
Det
Norske
Teatret
and
Oslo
Nye
Teater
.
His:O
plays:O
were:O
staged:O
at:O
various:O
theatres:O
,:O
including:O
Nationaltheatret:building-theater
,:O
Det:building-theater
Norske:building-theater
Teatret:building-theater
and:O
Oslo:building-theater
Nye:building-theater
Teater:building-theater
.:O