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
aircraft
was
unable
to
recover
power
before
hitting
the
ground
.
The:O
aircraft:O
was:O
unable:O
to:O
recover:O
power:O
before:O
hitting:O
the:O
ground:O
.:O