With no explanation, label each line with "O", "other-medical", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
most
potent
aphrodisiacs
,
according
to
Levine
,
are
psychological
intimacy
and
voyeurism
:
``
looking
at
pictures
or
movies
of
people
engaged
in
genital
or
romantic
interplay
.
''
The:O
most:O
potent:O
aphrodisiacs:other-medical
,:O
according:O
to:O
Levine:person-other
,:O
are:O
psychological:O
intimacy:O
and:O
voyeurism:O
::O
``:O
looking:O
at:O
pictures:O
or:O
movies:O
of:O
people:O
engaged:O
in:O
genital:O
or:O
romantic:O
interplay:O
.:O
'':O