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Hi, > P.S. Just for information, here is the specification of the Bitset > (BSET) data type I use. It turned out to be useful, convenient, and > complete for its purpose (which is of course only one of the > potential applications of bit-twiddling): You may be interested in the following portable library which provides a compact representation of integer sets and an API matching the full SRFI-14 (one of the primary uses of this was to represent character sets). http://www.call-with-current-continuation.org/eggs/iset.html Although it's implemented using bit operations, what you describe is a set of integers, so in the above library they are called isets. -- Alex