With no explanation, label each line with "product-other", "product-game", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
first
virtual
representation
of
the
McKenna
MOUT
site
was
based
on
the
shooter
PC
game
,
Tom
Clancy
's
Rainbow
Six
3
:
Raven
Shield1
,
which
focused
on
small
unit
warfare
in
urban
environments
.
The:O
first:O
virtual:O
representation:O
of:O
the:O
McKenna:O
MOUT:O
site:O
was:O
based:O
on:O
the:O
shooter:O
PC:product-other
game:O
,:O
Tom:product-game
Clancy:product-game
's:product-game
Rainbow:product-game
Six:product-game
3:product-game
::product-game
Raven:product-game
Shield1:product-game
,:O
which:O
focused:O
on:O
small:O
unit:O
warfare:O
in:O
urban:O
environments:O
.:O