Question 1208383
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Why can't the elements of a set repeat?
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This is a rule for representing/enumerating elements of a set, 
established in Mathematics by mathematicians as a general agreement.


Not a subject to discussion by other mortals - 
- only the subject to follow this rule strictly.



It's like an accountant in his transaction ledger will not record the same transaction twice.


                        If he will do it, he will lose his job.