deb http://ftp.us.debian.org/debian/ stretch main

deb-src http://ftp.us.debian.org/debian/ stretch main

deb http://ftp.us.debian.org/debian jessie-backports main

deb http://security.debian.org/ stretch/updates main contrib

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

# stretch-updates, previously known as 'volatile'

deb http://ftp.us.debian.org/debian/ stretch-updates main contrib

deb-src http://ftp.us.debian.org/debian/ stretch-updates main contrib