With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
At
its
launch
in
1990
,
it
was
the
only
privately
owned
and
operated
convention
center
in
the
United
States
,
and
was
the
second
largest
convention
center
in
the
world
.
At:O
its:O
launch:O
in:O
1990:O
,:O
it:O
was:O
the:O
only:O
privately:O
owned:O
and:O
operated:O
convention:O
center:O
in:O
the:O
United:location-GPE
States:location-GPE
,:O
and:O
was:O
the:O
second:O
largest:O
convention:O
center:O
in:O
the:O
world:O
.:O