...Simon
Part of this work was done while the author was visiting the Université de Rouen, in 1987. That visit was partially supported by FAPESP.
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...UNIX
UNIX is a trademark of Bell Laboratories
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...sequences
The sequences we consider are usually called words. We avoid this terminology since it might lead to confusion because of the widespread misuse of the term subword (meaning a segment or a factor instead of a subsequence).
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Imre Simon
Wed May 28 19:09:09 EST 1997