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/usr/lib/help/string-to-list is in scheme9 2013.11.26-1.

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R4RS 6.7  (string->list string)  ==>  list
          (list->string chars)   ==>  string

STRING->LIST returns a newly allocated list of the characters that
make up the given string. LIST->STRING returns a newly allocated
string formed from the characters in the list CHARS. STRING->LIST
and LIST->STRING are inverses so far as EQUAL? is concerned.