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
files
are
usually
7-bit
ASCI
I
plain
text
.
RTF:product-other
files:O
are:O
usually:O
7-bit:O
ASCI:product-other
I:O
plain:O
text:O
.:O