With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Construction
of
the
amphitheater
began
in
1936
and
was
opened
to
the
public
in
June
1941
.
Construction:O
of:O
the:O
amphitheater:O
began:O
in:O
1936:O
and:O
was:O
opened:O
to:O
the:O
public:O
in:O
June:O
1941:O
.:O