deb http://ftp.de.debian.org/debian/ squeeze main non-free contrib
deb-src http://ftp.de.debian.org/debian/ squeeze main non-free contrib
deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free
# squeeze-updates, previously known as 'volatile'
deb http://ftp.debian.org/debian squeeze-updates main contrib non-free
deb-src http://ftp.debian.org/debian squeeze-updates main contrib non-free
deb http://backports.debian.org/debian-backports squeeze-backports main