With no explanation, label each line with "O", "location-other", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Barcelona
Metro
station
is
served
by
TMB
-operated
line
L1
.
The:O
Barcelona:location-other
Metro:location-other
station:location-other
is:O
served:O
by:O
TMB:organization-other
-operated:O
line:O
L1:O
.:O