CV does not include DD strategies for most systems, including BS, as most books don't.
Generally, index decisions can be charted as two lines that intersect at one point. Defensive splits can intersect at two points. Most of the time, one point doesn't occur enough to matter. However, with unbalanced counts, this doubling back is more likely to matter because of the fact the average count varies by current penetration. It's rare that it makes any difference and I've never seen this mentioned in any book.
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