deb https://ftp.debian.org/debian/ sid contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ sid contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ sid-updates contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ sid-updates contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ sid-proposed-updates contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ sid-proposed-updates contrib main non-free non-free-firmware

deb https://ftp.debian.org/debian/ sid-backports contrib main non-free non-free-firmware
deb-src https://ftp.debian.org/debian/ sid-backports contrib main non-free non-free-firmware

deb https://security.debian.org/debian-security/ sid-security contrib main non-free non-free-firmware
deb-src https://security.debian.org/debian-security/ sid-security contrib main non-free non-free-firmware

deb [arch=amd64 signed-by=/usr/share/keyrings/oracle-virtualbox-2016.gpg] https://download.virtualbox.org/virtualbox/debian sid contrib