With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
museum
is
located
in
an
18th-century
warehouse
,
the
,
next
to
Douro
River
.
The:O
museum:O
is:O
located:O
in:O
an:O
18th-century:O
warehouse:O
,:O
the:O
,:O
next:O
to:O
Douro:location-bodiesofwater
River:location-bodiesofwater
.:O