I've got a variable, host\_list, which is a different list for all hosts.
I'm looking to a way to make a union of host\_list accross hosts.
Meaning, I'd like to have overall\_list containing all element of host\_list of all host.

Input:

`- fe1: [ "W", "Z" ]
 - be1: [ "Z", "X" ]`

Ouput:
overall\_list: [ "W", "Z", "X" }

How can I do so?

Thanks,
Raoul