deb http://apt.llvm.org/stretch/ llvm-toolchain-stretch-6.0 main
deb-src http://apt.llvm.org/stretch/ llvm-toolchain-stretch-6.0 main

deb http://ftp.us.debian.org/debian testing main contrib non-free

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

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

#Debian Backports
deb http://http.debian.net/debian stretch-backports main

deb http://mirrors.kernel.org/debian/ stable main
deb-src http://mirrors.kernel.org/debian/ stable main

# stable-updates, previously known as 'volatile'
deb http://mirrors.kernel.org/debian/ stable-updates main
deb-src http://mirrors.kernel.org/debian/ stable-updates main