Question: (4) State how many possible partial order relations U there are on the set {a, b, c, d} such that bUC, cUd, aVc and cVa.

(4) State how many possible partial order relations U there are on the set {a, b, c, d} such that bUC, cUd, aVc and cVa. Draw a Hasse diagram for each possible relation

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