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S9 LIB  (string-parse string1 string2)  ==>  list

Split a string into substrings. STRING1 is a set of separators.
Return a list containing all coherent sequences of non-separating
characters contained in the given string.

(string-parse " ?" " to be  or  not to be? ")
  ==>  ("to" "be" "or" "not" "to" "be")