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    >>> _nan_equal(Decimal('NAN'), Decimal('sNAN'))
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    If given, both tol and rel must be finite, non-negative numbers. If not
    given, default values are tol=1e-12 and rel=1e-7.

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    equal to rel, x and y are considered approximately equal.

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    individually.

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        ...     def test_sequence(self):
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        ...         b = [1.0, 1e-10, 1e10]
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