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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} {1,2,4} {1,3,4} {2,3,4} {1,2,3,4}
c. C= {a} {i} {u} {o} {a,i} {a,u} {a,o} {i,u} {i,e} {i,o} {u,e} {u,o} { e,o}