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

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

deb http://archive.debian.org/debian stretch-updates main
deb-src http://archive.debian.org/debian stretch-updates main