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 ":".
It
is
the
western
outpost
of
the
main
central
Berwyn
range
.
It:O
is:O
the:O
western:O
outpost:O
of:O
the:O
main:O
central:O
Berwyn:location-mountain
range:O
.:O