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

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

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