[tlaplus] Function sets with distinct mappings

["thomas...@xxxxxxxxx" <thomasgebert@xxxxxxxxx>]

I am trying to make a set of functions of mappings of sender->receiver: 

Users == {"jack", "jill", "cindy", "bobby"}

UserSenderSet == [Users -> Users]

This almost does what I want, but we have many functions where sender->receiver are the same person, which is not what I want:

[jack |-> "jack", jill |-> "jack", cindy |-> "jack", bobby |-> "jack"]

How do I go about filtering down to set of functions that don't contain mappings of to themselves?

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