With no explanation, label each line with "location-GPE", "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
One
of
the
aircraft
at
the
show
was
the
``
Spirit
of
Freedom
``
Douglas
C-54
Skymaster
used
in
the
Berlin
Blockade
(
or
Berlin
Airlift
)
.
One:O
of:O
the:O
aircraft:O
at:O
the:O
show:O
was:O
the:O
``:O
Spirit:product-airplane
of:product-airplane
Freedom:product-airplane
``:O
Douglas:product-airplane
C-54:product-airplane
Skymaster:product-airplane
used:O
in:O
the:O
Berlin:location-GPE
Blockade:O
(:O
or:O
Berlin:location-GPE
Airlift:O
):O
.:O