Thank you, Jürgen and Jean.
I'll try.
There was no a particular reason to write it through fixed-point combinator only my deep despair, because I could not find some workaround.
 
2010/9/1 Jürgen Doser jurgen.doser@gmail.com

Btw., is there a particular reason why you did not try to write the
recursion explicitely, but used the function s?

       Jürgen

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