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from disown import *
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a = A()
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tmp = a.thisown
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a.thisown = 0
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if a.thisown:
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raise RuntimeError
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a.thisown = 1
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if (not a.thisown):
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raise RuntimeError
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a.thisown = tmp
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if (a.thisown != tmp):
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raise RuntimeError
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b = B()
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b.acquire(a)
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if a.thisown:
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raise RuntimeError
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