what trick(s) do y'all like to use to create a bootable thumb drive,
bootable on either efi or bios, containing ISOs of
  +  an ubuntu variant,
  +  rhel or centos,
  +  pfsense or freebsd,
  +  win10,
or even a decent subset of these?  just the linuxen are easy, but win10
bootable too, on the same stick?  and maybe even pfsense or freebsd?
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