Make up your mind.

You said:
Quote:

but not all the users are members of all this groups



Now you are saying:
Quote:

1 Ingroup checks for membership of ALL of the groups in the list. Isn't that what I want to accomplish?



I cannot attest to what YOU want to accomplish if you contradict yourself.

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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.