With no explanation, label each line with "location-GPE", "O", "building-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
However
,
many
longtime
Chicago
residents
still
refer
to
the
station
as
``
North
Western
Station
,
''
and
many
longtime
employees
still
call
it
``
CPT
,
''
for
``
Chicago
Passenger
Terminal
.
''
However:O
,:O
many:O
longtime:O
Chicago:location-GPE
residents:O
still:O
refer:O
to:O
the:O
station:O
as:O
``:O
North:building-other
Western:building-other
Station:building-other
,:O
'':O
and:O
many:O
longtime:O
employees:O
still:O
call:O
it:O
``:O
CPT:building-other
,:O
'':O
for:O
``:O
Chicago:building-other
Passenger:building-other
Terminal:building-other
.:O
'':O