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 ":".
He
explained
that
he
had
not
forgotten
the
lyrics
,
but
that
the
crowd
had
been
singing
loudly
out
of
time
.
He:O
explained:O
that:O
he:O
had:O
not:O
forgotten:O
the:O
lyrics:O
,:O
but:O
that:O
the:O
crowd:O
had:O
been:O
singing:O
loudly:O
out:O
of:O
time:O
.:O