六、Determine whether the poset (Partially Ordered Set) (S, ⊆) is a
lattice where ? ={∅, {1}, {2}, {4}, {1,2}, {1,4}, {3,4}, {1,2,4},{2,3,4}, {1,2,3,4}}

Please draw its Hasse diagram and explain your answer. (10%)

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