deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-15 main
deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-16 main
deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-17 main
deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-18 main