With no explanation, label each line with "O", "person-politician", "art-music", "person-director", "person-other", "art-broadcastprogram", "art-film", "art-other", "art-painting" or "art-writtenart" preceded by ":".
In
January
2008
,
Harper
participated
in
``
Yes
We
Can
``
,
a
music
video
produced
by
will.i.am
supporting
presidential
candidate
Barack
Obama
.
In:O
January:O
2008:O
,:O
Harper:person-other
participated:O
in:O
``:O
Yes:art-music
We:art-music
Can:art-music
``:O
,:O
a:O
music:O
video:O
produced:O
by:O
will.i.am:person-director
supporting:O
presidential:O
candidate:O
Barack:person-politician
Obama:person-politician
.:O