With no explanation, label each line with "O", "person-director", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
During
this
period
,
he
appeared
in
two
plays
by
Labiche
,
alongside
:
During:O
this:O
period:O
,:O
he:O
appeared:O
in:O
two:O
plays:O
by:O
Labiche:person-director
,:O
alongside:O
::O