UE4 Prerequisites installer contents; full uninstall procedure.

Can anyone list the bundled contents of the UE4 prerequisites installer?
I have found that even after uninstalling the prerequisites installer, UE4 executables run just fine.
This indicates to me that the uninstaller for UE4 prerequisites does not fully remove its components if at all.

For testing purposes, I want to understand how to “un prerequisite” a target machine.

Can anyone list the various installers that are bundled into the UE4 prereqs installer so that we can uninstall them one by one to return a target machine to its pre installation state?