With no explanation, label each line with "other-god", "location-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Pluto
later
held
the
Avengers
prisoner
in
Tartarus
at
Zeus
's
behest
,
but
the
Avengers
battled
their
way
out
and
escaped
.
Pluto:other-god
later:O
held:O
the:O
Avengers:O
prisoner:O
in:O
Tartarus:location-other
at:O
Zeus:location-other
's:O
behest:O
,:O
but:O
the:O
Avengers:O
battled:O
their:O
way:O
out:O
and:O
escaped:O
.:O