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
first
appeared
in
OpenBSD
2.6
and
is
now
by
far
the
most
popular
SSH
client
and
server
,
available
on
many
operating
systems
.
It:O
first:O
appeared:O
in:O
OpenBSD:product-software
2.6:product-software
and:O
is:O
now:O
by:O
far:O
the:O
most:O
popular:O
SSH:product-software
client:O
and:O
server:O
,:O
available:O
on:O
many:O
operating:O
systems:O
.:O