With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
RTF
consists
of
control
words
,
control
symbols
,
and
groups
.
RTF:product-other
consists:O
of:O
control:O
words:O
,:O
control:O
symbols:O
,:O
and:O
groups:O
.:O