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 ":".
The
fuel
was
ionized
by
contact
with
a
charged
tungsten
electrode
.
The:O
fuel:O
was:O
ionized:O
by:O
contact:O
with:O
a:O
charged:O
tungsten:O
electrode:O
.:O