From: Miguel Carrasquer
>"Six" and "seven" are borrowed (presumably) from AfroAsiatic toBut that completely ignores the difference between the initial sibilants (s^- in
>IndoEuropean and also to Etruscan (sa, semph), Basque
>(sei, zazpi) and Kartvelian (ekvsi, shvidi ). They seem alway to
>follow each other. Because of some IE reflexes of "six" that
>don't seem to have the initial s- (Old Prussian, some Iranian
>languages), that part of the root is sometimes left optional; this
>also makes it easier to reconcile the root with Kartvelian (Georgian
>/ekwsi/. Which gave me this idea: Suppose s- is some kind of "number prefix"
>*se- in whichever was the original language of six and seven? (Basque
>would have it double, *se-pi- > *spi-, prefix now unrecognizable, so
>it's added again: *se-spi-.) And seven, without the prefix would be
>*pitu-, which, voila!, is "seven" in nearly all Austronesian languages
>http://www.zompist.com/anes.htmThe Proto-Nakh forms are *jalX (X = uvular fricative) and *worL (L = lateral
>This might also take care of Northwest Caucasian (eg. Kabard- Cherkes
>(x^e, bLe; both prefix-less!), Proto-Nakh (Proto-Nakh+ *jalx, *worl,
>also both prefix-less).
>Notice also Guanche (Tenerife) cansa "five".Borrowed from Semitic, like arba "4".