Let S={a, b, c, d, e, f} be ordered as in Fig. 14-18(b). (a) Find all minimal and maximal elemen

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Step 1: Understand the structure of the set u005C( S u003D u005C{a, b, c, d, e, fu005C} u005C) as ordered in Fig. 14

Let $S=\{a, b, c, d, e, f\}$ be ordered as in Fig. 14-18(b). (a) Find all minimal and maximal elements of $S$. (b) Does $S$ have any first or last element? (c) List all linearly ordered subsets with three or more elements.