> Maybe clock the illegal state forward N ticks and check each of the ancestors > less than N + 5 clocks away from that new forward state whether there is > one that produces the same keystream. If i am correct and the 2 compatible > states are "close together" then they could very well be found that way. > to be more precise: isn't any illegal state necessarily a dead end ancestor of some followup state and thus the sibling of a valid state?
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