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

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S9 LIB  (mode->string integer)  ==>  string

Return a symbolic representation of the access mode specified in
INTEGER. The resulting string is in the same format as used by
the ls(1) Unix command.

(mode->string #o5751)  ==>  "rwsr-x--t"