With no explanation, label each line with "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
system
is
being
operated
from
4
fixed
locations
on
the
Pilatus
,
Scopi
,
Weisshorn
and
Weissfluh
mountains
.
This:O
system:O
is:O
being:O
operated:O
from:O
4:O
fixed:O
locations:O
on:O
the:O
Pilatus:location-mountain
,:O
Scopi:location-mountain
,:O
Weisshorn:location-mountain
and:O
Weissfluh:location-mountain
mountains:O
.:O