vi macro assistance

[David Lesher]

OK, I did so well with my last question, I'm back.
[Thanks for all the correct answers I received]
Besides, comp.editors came up empty. I guess all the experts are
over here...

I'm trying to build a vi macro that will backup by the ENDS of
words. For example, in the previous sentence, it would go: 
	. s f S e
and so forth. My crude attempts break if there is a single-letter
word or a punct. mark involved.

Suggestions?
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