With no explanation, label each line with "building-library", "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Pittsburgh
Photographic
Library
is
a
photography
repository
held
by
the
Carnegie
Library
of
Pittsburgh
of
over
50,000
prints
and
negatives
relating
to
history
of
Pittsburgh
.
The:O
Pittsburgh:building-library
Photographic:building-library
Library:building-library
is:O
a:O
photography:O
repository:O
held:O
by:O
the:O
Carnegie:building-library
Library:building-library
of:building-library
Pittsburgh:building-library
of:O
over:O
50,000:O
prints:O
and:O
negatives:O
relating:O
to:O
history:O
of:O
Pittsburgh:location-GPE
.:O