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b. {1}, {2}, {3}, {4}, {1,2}, {1,3}, {1,4}, {2,3}, {2,4}, {3,4}, {1,2,3,4}
c. {a}, {i}, {u}, {e}, {o}, {a,i}< {a,u}, {a,e}, {a,o}, {i,u}, {i,e}, {i,o}, {u,e}, {u,o}, {e,o}, {a,i,u,e,o}