Another list member mentioned (off-list) the system of 9 bigrams and 81 tetragrams.
These appear in the text of a book called [U+592a][U+7384][U+7d93]
<Tai Xuan Jing> by [U+63da][U+96c4] Yang Xiong.(c.53BC-c.18AD).
Where the 64 hexagrams are based on a binary system,
the 81 tetragrams are based on a trinary system.
They're much less well-known, a relatively recent innovation, and a much
less influential imitation of <Zhou Yi>.
I don't think anyone is proposing to encode these ... are you?
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