Diamond problem in multiple inheritance

- 
class A:

    def met(self):
        print("this is a method in class A")


class B(A):

    def met(self):
        print("this is a method in class B")


class C(A):

    def met(self):
        print("this is a method in class C")


class D(B, C):

    def met(self):
        print("this is a method in class D")


a = A()
b = B()
c = C()
d = D()
d.met()

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