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class A(object): pass

class B(object): pass

class C(object): pass

class D(object): pass

class E(object): pass

class K1(A, B, C): pass

class K2(D, B, E): pass

class K3(D, A): pass

class M(K1, K2, K3): pass

#>>> M.mro()
# [M, K1, K2, K3, D, A, B, C, E, object]