When the elements in the set s are all natural numbers, and satisfy the proposition "if x belongs to s, then 8-x belongs to s", Try to write all of s with 3 elements? My question Why are there three elements? If you take 1, then 8-1 = 7, then 8-7 or return to 1, how can there be three elements?

It should be noted that 4 is a special element

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