might not think of as plural at all if you were brought up speaking
other languages.  I don't think it's specifically parts of the body,
though -- isn't ``deupen'' the same formation?  This would be two
matched ends of something, like the same piece of string, or the
same journey, rather than the two heads of a mythical beast.  Words
like `deutu' (o ddeutu -- around, lit. at both sides) `deuparth',
`deuddydd', `deugain', and so on, none of which mean quite the same
as the corresponding two-of forms.  They seem to hint at `together'.         g