With no explanation, label each line with "location-GPE", "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
was
held
at
the
Mellon
Arena
in
Pittsburgh
,
Pennsylvania
on
October
21–24
.
It:O
was:O
held:O
at:O
the:O
Mellon:building-other
Arena:building-other
in:O
Pittsburgh:location-GPE
,:O
Pennsylvania:location-GPE
on:O
October:O
21–24:O
.:O