With no explanation, label each line with "other-disease", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
cause
of
RAS
is
not
clear
.
The:O
cause:O
of:O
RAS:other-disease
is:O
not:O
clear:O
.:O