# testing
deb http://deb.debian.org/debian/ testing main non-free-firmware contrib non-free
# testing-security 
deb http://deb.debian.org/debian-security/ testing-security main non-free-firmware contrib non-free
# unstable
deb http://deb.debian.org/debian/ unstable main non-free-firmware contrib non-free
# experimental
deb http://deb.debian.org/debian/ experimental main non-free-firmware contrib non-free