With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
and
MS-DOS
were
identical
products
that
eventually
diverged
starting
with
MS-DOS
version
6.0
.
It:O
and:O
MS-DOS:product-software
were:O
identical:O
products:O
that:O
eventually:O
diverged:O
starting:O
with:O
MS-DOS:product-software
version:product-software
6.0:product-software
.:O