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 ":".
By
this
stage
,
her
voice
was
in
premature
decline
due
to
overwork
.
By:O
this:O
stage:O
,:O
her:O
voice:O
was:O
in:O
premature:O
decline:O
due:O
to:O
overwork:O
.:O