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 ":".
A
wide
variety
of
proprietary
networking
systems
were
directly
based
on
XNS
or
offered
minor
variations
on
the
theme
.
A:O
wide:O
variety:O
of:O
proprietary:O
networking:O
systems:O
were:O
directly:O
based:O
on:O
XNS:product-software
or:O
offered:O
minor:O
variations:O
on:O
the:O
theme:O
.:O