deb http://www.t.ring.gr.jp/pub/linux/debian/debian stable main contrib non-free
deb http://www.t.ring.gr.jp/pub/linux/debian/debian-jp stable-jp main contrib non-free
deb http://www.t.ring.gr.jp/pub/linux/debian/debian-non-US stable/non-US main contrib non-free
deb http://security.debian.org/ stable/updates main contrib non-free