No need to OR it unless you have a very old version of KiX. InGroup supports the passing of multiple group names.
Quote:

InGroup( )

Action: Checks whether the current user is a member of a group.

Syntax: INGROUP ("group name" [<,> "group name 2"], mode)

Parameters: Group name, group name 2, group name X…
Identifies the group(s) in which to check the user's membership. You may pass multiple group names as arguments -or- a single array who's element(s) are the names of one or more groups to test. Note: This function does not currently support passing multiple arrays as arguments.





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