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 ":".
Cadet
Princeps
Ervin
Hekate
is
forced
to
take
command
and
joins
the
Imperial
Guard
defenders
against
invading
aliens
,
the
Tyranids
.
Cadet:O
Princeps:person-other
Ervin:person-other
Hekate:person-other
is:O
forced:O
to:O
take:O
command:O
and:O
joins:O
the:O
Imperial:organization-other
Guard:organization-other
defenders:O
against:O
invading:O
aliens:O
,:O
the:O
Tyranids:organization-other
.:O