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 ":".
Horses
were
often
used
on
the
canal
tow
path
.
Horses:O
were:O
often:O
used:O
on:O
the:O
canal:O
tow:O
path:O
.:O