With no explanation, label each line with "O", "organization-other", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
However
,
he
later
betrays
Jak
,
tries
to
kill
Vin
,
and
allows
the
Metal
Heads
into
the
city
.
However:O
,:O
he:O
later:O
betrays:O
Jak:person-other
,:O
tries:O
to:O
kill:O
Vin:person-other
,:O
and:O
allows:O
the:O
Metal:organization-other
Heads:organization-other
into:O
the:O
city:O
.:O