deb-src  http://ftp.de.debian.org./debian             bookworm                  main contrib non-free-firmware
deb-src  http://ftp.de.debian.org./debian             bookworm-updates          main contrib non-free-firmware
deb-src  http://ftp.de.debian.org./debian             bookworm-proposed-updates main contrib non-free-firmware
deb-src  http://security.debian.org./debian-security  bookworm-security         main contrib non-free-firmware
deb-src  http://ftp.de.debian.org./debian             bookworm-backports        main contrib non-free-firmware