With no explanation, label each line with "O", "location-other", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Knowing
that
there
was
only
one
option
to
save
the
Earth
,
Zero
rejects
Ciel
's
plea
to
transfer
out
of
Ragnarok
and
back
to
the
Resistance
Base
and
sacrifices
his
life
to
destroy
Ragnarok
's
core
before
it
crashes
to
Earth
.
Knowing:O
that:O
there:O
was:O
only:O
one:O
option:O
to:O
save:O
the:O
Earth:O
,:O
Zero:person-other
rejects:O
Ciel:person-other
's:O
plea:O
to:O
transfer:O
out:O
of:O
Ragnarok:location-other
and:O
back:O
to:O
the:O
Resistance:location-other
Base:location-other
and:O
sacrifices:O
his:O
life:O
to:O
destroy:O
Ragnarok:location-other
's:O
core:O
before:O
it:O
crashes:O
to:O
Earth:location-other
.:O