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