With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
An
average
day
sees
60
to
110
trains
of
all
types
.
An:O
average:O
day:O
sees:O
60:O
to:O
110:O
trains:O
of:O
all:O
types:O
.:O