Tiny formatting tweak.
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@ -120,8 +120,10 @@ commutative. If we find some, the class can be added later.::
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"""Associative commutative operation, whose inverse is negation."""
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raise NotImplementedError
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# **Open issue:** Do we want to give people a choice of which of the
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# following to define, or should we pick one arbitrarily?::
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**Open issue:** Do we want to give people a choice of which of the
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following to define, or should we pick one arbitrarily?::
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# AdditiveGroup, continued
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def __neg__(self):
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"""Must define this or __sub__()."""
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