With no explanation, label each line with "O", "product-software", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Maintained
as
open-source
software
until
1987
by
a
research
group
at
Ohio
State
University
,
Twixt
ultimately
saw
use
in
approximately
800
groundbreaking
animated
television
and
advertising
projects
.
Maintained:O
as:O
open-source:O
software:O
until:O
1987:O
by:O
a:O
research:O
group:O
at:O
Ohio:organization-education
State:organization-education
University:organization-education
,:O
Twixt:product-software
ultimately:O
saw:O
use:O
in:O
approximately:O
800:O
groundbreaking:O
animated:O
television:O
and:O
advertising:O
projects:O
.:O