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(emacs-lisp-intro.info)Looping exercise

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Looping Exercise
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   * Write a function similar to `triangle' in which each row has a
     value which is the square of the row number.  Use a `while' loop.

   * Write a function similar to `triangle' that multiplies instead of
     adds the values.

   * Rewrite these two functions recursively.  Rewrite these functions
     using `cond'.

   * Write a function for Texinfo mode that creates an index entry at
     the beginning of a paragraph for every `@dfn' within the paragraph.
     (In a Texinfo file, `@dfn' marks a definition.  For more
     information, see *Note Indicating Definitions:
     (texinfo)Indicating.)