With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
one
of
the
southernmost
points
at
which
alpine
ecosystems
occur
in
the
United
States
.
It:O
is:O
one:O
of:O
the:O
southernmost:O
points:O
at:O
which:O
alpine:O
ecosystems:O
occur:O
in:O
the:O
United:location-GPE
States:location-GPE
.:O