With no explanation, label each line with "O", "location-mountain", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
main
geographical
features
include
mountains
such
as
the
Ridge-and-valley
Appalachians
in
the
northwest
,
the
Blue
Ridge
Mountains
in
the
northeast
,
the
Piedmont
plateau
in
the
central
portion
of
the
state
and
Coastal
Plain
in
the
south
.
The:O
main:O
geographical:O
features:O
include:O
mountains:O
such:O
as:O
the:O
Ridge-and-valley:location-mountain
Appalachians:location-mountain
in:O
the:O
northwest:O
,:O
the:O
Blue:location-mountain
Ridge:location-mountain
Mountains:location-mountain
in:O
the:O
northeast:O
,:O
the:O
Piedmont:location-mountain
plateau:O
in:O
the:O
central:O
portion:O
of:O
the:O
state:O
and:O
Coastal:location-other
Plain:location-other
in:O
the:O
south:O
.:O