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Maximal elements: 2,3 and 5 Minimal elements: 4,5 and 6

I just want to confirm to make sure that I understand maximal and minimal elements correctly.

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Yes. Those which appear only on the left side, are minimal, those only on the right side are maximal (after having removed the $(a,a)$ pairs, to be precise).

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    Thank you for confirming :)2012-11-07