Select the right question Security should ask:
"Have you been invited or you are a liar?" and let in only those answerring "Yes"
"Have you been invited to this event, and you are either a liar or a truth teller?" Let in only those answerring "Yes"
"Is one of the following true? You have not been invited to this event and you are a liar, or you have been invited and you are a truth teller." Let in only those answerring "Yes"
Other:
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