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class A1():
pass
class A2():
def who_am_i(self):
print("I am a A2")
class A3():
def who_am_i(self):
print("I am a A3")
class B(A1,A2):
pass
class C(A3):
def who_am_i(self):
print("I am a C")
class D(C,B):
pass
d1 = D()
d1.who_am_i()
print(D.__mro__)