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option: mask list set operations #8

Description

@roycewilliams

Would be super useful to have a general way to merge, split, expand, and detect overlap in lists of masks.

For example, these masks:

?l?l?l?l?l?l?l
?l?l?l?l?l?l?u
?l?l?l?l?l?l?d
?l?l?l?l?l?l?s

... could be merged to:

?l?l?l?l?l?l?a

"Splitting" would be the opposite - turning ?a into its components.

Expanding could also be useful, perhaps with thresholding that is a little more sophisticated, based on target keyspace or runtime. For example:

?l?l?l?l?l

... could be split to:

?l?l?l?la
?l?l?l?lb
?l?l?l?lc
[etc]

... to fit a specific target runtime (--PPS).

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