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
Western
remains
of
the
hill
are
retained
by
a
large
concrete
wall
.
The:O
Western:O
remains:O
of:O
the:O
hill:O
are:O
retained:O
by:O
a:O
large:O
concrete:O
wall:O
.:O