With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Vatican
City
is
also
linked
to
Italy
with
a
railway
line
serving
a
single
railway
station
,
the
Vatican
City
railway
station
.
The:O
Vatican:location-GPE
City:location-GPE
is:O
also:O
linked:O
to:O
Italy:location-GPE
with:O
a:O
railway:O
line:O
serving:O
a:O
single:O
railway:O
station:O
,:O
the:O
Vatican:location-GPE
City:location-GPE
railway:O
station:O
.:O