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b. B= {{ } ,[1}, {2}, {3}, {4}, {1,2} , {1,3} {1,4}, {2,3} {2,4}, {3,4} , {1,2,3,4}}
c. 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}}