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class A(object):
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a:int = 42
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a1:A = None
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a2:A = None
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a3:A = None
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a4:A = None
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a1 = A()
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a2 = a1
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a3 = A()
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print(a1 is a1)
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print(a1 is a2)
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print(a1 is a3)
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print(a1 is a4)
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print(a1 is None)
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print(a4 is None)
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print(None is None)
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