Answer Posted / dan stufflebeam

There are actually up to 7th Normal Forms (but anyone who
goes beyond 4th or 5th is insane.

6th NF: http://en.wikipedia.org/wiki/Sixth_normal_form

7th NF:
http://wedonotuse.blogspot.com/2005/11/ukoug-scotland-tuomas-7th-nf.html

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