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Brad Lucier wrote: > My unstated (definitely understated) point is that predicate->bitset > will never return in the general case, which isn't much different from > how long it will take predicate->char-set to return on systems that use > a four-byte character representation. A simple benchmark suggests that, on current 64-bit hardware, with a 32-bit character code and a simple predicate that few characters satisfy, PREDICATE->CHAR-SET would return in about an hour... ...but it would run in constant time! Will