Correct swaack.
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@@ -324,7 +324,12 @@ def swaack(stack):
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([...1] -- [...0])
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([...1] -- [...0])
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"""
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"""
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(s1, s0) = stack
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try:
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(s1, s0) = stack
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except ValueError:
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raise StackUnderflowError('Not enough values on stack.')
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if not isinstance(s1, tuple):
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raise NotAListError('Not a list.')
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return (s0, s1)
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return (s0, s1)
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