15. For the poset given by ({{2,3},{1,3},{2,3,5},{1,2,3},{5},{1,3,4,5},{1,2,3,5}},⊆): (a) Draw a Hasse diagram. (b) Find the maximal elements. (c) Find the minimal elements. (d) Find all upper bounds of {{2,3},{5}}. (e) Find the least upper bound of {{2,3},{5}} if it exists.

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