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things = {'Socrates', 'Plato', 'Eratosthenes', 'Zeus', 'Hera', 'Athens', 'Acropolis', 'Cat', 'Dog'}
men = {'Socrates', 'Plato', 'Eratosthenes'}
mortals = {'Socrates', 'Plato', 'Eratosthenes', 'Cat', 'Dog'}
A =
B =
C =
D =
E =