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        Args:
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              IPv6Network('2001:db8::1000/124') <
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            0 if self == other
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              IPv6Network('2001:db8::1000/124') ==
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            1 if self > other
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            prefixlen_diff: An integer, the amount the prefix length
              should be increased by. This should not be set if
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            new_prefix: The desired new prefix length. This must be a
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        Returns:
            An iterator of IPv(4|6) objects.

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