Hi all,

To fold operations from right to left,
accumulate what calculations should be done in a list with *cons* in order 
(Thanks Tassilo) and
*comp*ose accumulated functions manually (Thanks Meikel, almost equivalent 
to using
Tassilo's *comp** I think) without reverse.

First, the initial topic *fold-right* and its family *reduce-right:*
 https://gist.github.com/2893987
Next, my abstraction for folding-from-right-loops *r-reduce:*
 https://gist.github.com/2896939
Last, related function *unfold*: https://gist.github.com/2901487

Have changed not to need large stack.
Have become very faster.
Still need little bit of heap.

Regards,
Yoshinori Kohyama

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