With no explanation, label each line with "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Zürich
HB
is
served
by
more
than
2,900
trains
daily
.
Zürich:location-other
HB:location-other
is:O
served:O
by:O
more:O
than:O
2,900:O
trains:O
daily:O
.:O