deb http://ftp.jp.debian.org/debian/ stretch main non-free contrib
deb-src http://ftp.jp.debian.org/debian/ stretch main non-free contrib

deb http://security.debian.org/ stretch/updates main non-free contrib
deb-src http://security.debian.org/ stretch/updates main non-free contrib

deb http://download.atmark-techno.com/debian/ stretch main contrib non-free