With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
tunnels
are
now
part
of
the
PATH
train
system
.
The:O
tunnels:O
are:O
now:O
part:O
of:O
the:O
PATH:organization-other
train:O
system:O
.:O