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+The GPERF program creates perfect hash functions. From the author:
+
+While teaching a data structures course at University of California,
+Irvine, I developed a program called GPERF that generates perfect hash
+functions for sets of key words. A perfect hash function is simply:
+
+ A hash function and a data structure that allows
+ recognition of a key word in a set of words using
+ exactly 1 probe into the data structure.
+
+Output from the GPERF program is used to recognize reserved words in
+the GNU C, GNU C++, and GNU Pascal compilers, as well as with the GNU
+indent program.
+
+Douglas C. Schmidt