Update example: Counter.subtract returns None, not self
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@ -120,6 +120,7 @@ For example::
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>>> c = Counter(a=4, b=2, c=0, d=-2)
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>>> d = Counter(a=1, b=2, c=3, d=4)
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>>> c.subtract(d)
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>>> c
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Counter({'a': 3, 'b': 0, 'c': -3, 'd': -6})
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The usual dictionary methods are available for :class:`Counter` objects
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