[tex-hyphen] String preparation

[Philip Taylor]

Arthur Reutenauer wrote:
> there is a concept in Unicode, that of grapheme cluster
> (http://unicode.org/glossary/#grapheme_cluster)

I am intrigued to know why Unicode defines a grapheme cluster in terms
of a /horizontally/ segmentable unit of text :

> A grapheme cluster represents a horizontally segmentable unit of text,
Why not, I wonder, just a /segmentable/ unit of text; are there no
grapheme clusters in vertically-written languages ?

Philip Taylor
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