operaciones de conjuntos CA= AA BB CC BC DE CB= BB CC AB DD FF UNION CA U CB= AA BB CC BC DE AB DD FF DIFERENCIA CA- CB= AA BC DE INTERSECCION CA AND CB= BB CC

"""

def union(a, b):
  return a | b

def diferencia(a, b):
  return a - b

def interseccion(a, b):
  return a & b

CA = set(["AA", "BB", "CC", "BC", "DE"])
CB = set(["BB", "CC", "AB", "DD", "FF"])

print(union(CA, CB))
print(diferencia(CA, CB))
print(interseccion(CA, CB))