deb http://httpredir.debian.org/debian stable main contrib non-free
deb-src http://httpredir.debian.org/debian stable main contrib non-free

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

# jessie-updates, previously known as 'volatile'
deb http://httpredir.debian.org/debian stable-updates main contrib non-free
deb-src http://httpredir.debian.org/debian stable-updates main contrib non-free


# Backports repository
deb http://httpredir.debian.org/debian buster-backports main contrib non-free



# CRAN repository

deb https://stat.ethz.ch/CRAN/bin/linux/debian buster-cran40/