With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
is
unusual
for
an
extinction
to
be
recorded
with
such
precision
,
and
in
this
case
it
was
only
possible
because
observers
were
offshore
,
documenting
how
the
island
was
blasted
with
ejecta
.
It:O
is:O
unusual:O
for:O
an:O
extinction:O
to:O
be:O
recorded:O
with:O
such:O
precision:O
,:O
and:O
in:O
this:O
case:O
it:O
was:O
only:O
possible:O
because:O
observers:O
were:O
offshore:O
,:O
documenting:O
how:O
the:O
island:O
was:O
blasted:O
with:O
ejecta:O
.:O