With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
hydrogen
highway
is
necessary
for
HFCVs
to
be
used
.
The:O
hydrogen:other-chemicalthing
highway:O
is:O
necessary:O
for:O
HFCVs:O
to:O
be:O
used:O
.:O