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
stream
headwaters
arise
at
at
an
elevation
of
approximately
900
feet
.
The:O
stream:O
headwaters:O
arise:O
at:O
at:O
an:O
elevation:O
of:O
approximately:O
900:O
feet:O
.:O