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`strpbrk'--find chars in string

     #include <string.h>
     char *strpbrk(const char *S1, const char *S2);
This function locates the first occurence in the string pointed to by
S1 of any character in string pointed to by S2 (excluding the
terminating null character).
`strpbrk' returns a pointer to the character found in S1, or a null
pointer if no character from S2 occurs in S1.
`strpbrk' requires no supporting OS subroutines.