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:param ahi: The maximum length of a to check, typically len(a)
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:param bhi: The maximum length of b to check, typically len(b)
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:param answer: The return array. Will be filled with tuples
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:param maxrecursion: The maximum depth to recurse.
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Must be a positive integer.
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:return: None, the return value is in the parameter answer, which
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mutter('max recursion depth reached')
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# this will never happen normally, this check is to prevent DOS attacks