With no explanation, label each line with "O", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
When
Nazia
Hassan
and
Zoheb
Hassan
heard
it
,
they
refused
saying
they
did
n't
want
to
sing
a
copy
.
When:O
Nazia:person-artist/author
Hassan:person-artist/author
and:O
Zoheb:person-artist/author
Hassan:person-artist/author
heard:O
it:O
,:O
they:O
refused:O
saying:O
they:O
did:O
n't:O
want:O
to:O
sing:O
a:O
copy:O
.:O