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 ":".
However
,
the
X-33
program
was
cancelled
in
early
2001
after
the
project
had
problems
with
a
carbon
composite
hydrogen
fuel
tank
.
However:O
,:O
the:O
X-33:O
program:O
was:O
cancelled:O
in:O
early:O
2001:O
after:O
the:O
project:O
had:O
problems:O
with:O
a:O
carbon:O
composite:O
hydrogen:O
fuel:O
tank:O
.:O