deb https://deb.debian.org/debian/ oldstable    main contrib non-free
deb https://deb.debian.org/debian/ stable       main contrib non-free
deb https://deb.debian.org/debian/ testing      main contrib non-free
deb https://deb.debian.org/debian/ unstable     main contrib non-free
deb https://deb.debian.org/debian/ experimental main contrib non-free

## Sources
deb-src https://deb.debian.org/debian/ oldstable    main contrib
deb-src https://deb.debian.org/debian/ stable       main contrib
deb-src https://deb.debian.org/debian/ testing      main contrib
deb-src https://deb.debian.org/debian/ unstable     main contrib
#deb-src https://deb.debian.org/debian/ experimental main contrib

## Debug
deb https://deb.debian.org/debian-debug/ oldstable-debug    main contrib non-free
deb https://deb.debian.org/debian-debug/ stable-debug       main contrib non-free
deb https://deb.debian.org/debian-debug/ testing-debug      main contrib non-free
deb https://deb.debian.org/debian-debug/ unstable-debug     main contrib non-free
deb https://deb.debian.org/debian-debug/ experimental-debug main contrib non-free

## Old
#deb     https://deb.debian.org/debian/   stretch main
#deb-src https://deb.debian.org/debian/   stretch main
#deb     https://deb.debian.org/debian/   jessie main
#deb     https://archive.debian.org/debian/ wheezy main

# libsdl2 2.0.12+dfsg1-4
# cf. http://snapshot.debian.org/package/libsdl2/2.0.12%2Bdfsg1-4/
#deb-src [check-valid-until=no] https://snapshot.debian.org/archive/debian/20210115T203459Z/ bullseye main