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
was
never
revealed
if
this
was
a
true
accident
or
part
of
the
plan
laid
out
for
the
match
.
It:O
was:O
never:O
revealed:O
if:O
this:O
was:O
a:O
true:O
accident:O
or:O
part:O
of:O
the:O
plan:O
laid:O
out:O
for:O
the:O
match:O
.:O