Of course, I've never bought the three aett system: after all, why eight? The Norse had a base-12 number system, anyway. Six-rune aetts, eight-rune, twelve-rune, and twenty-four rune aetts are all about as likely as any of the others.
Of course, when I write about six-rune aetts, I'm gonna get blasted to Hel by most everyone who's studied runes even a bit.
Crazy that, no?