With no explanation, label each line with "O", "person-actor", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
addition
to
the
main
cast
,
the
series
featured
cameo
performances
from
Girls
Aloud
,
Boyzone
,
Matt
Willis
and
Gemma
Bissix
.
In:O
addition:O
to:O
the:O
main:O
cast:O
,:O
the:O
series:O
featured:O
cameo:O
performances:O
from:O
Girls:person-actor
Aloud:person-actor
,:O
Boyzone:person-actor
,:O
Matt:person-actor
Willis:person-actor
and:O
Gemma:person-actor
Bissix:person-actor
.:O