Re: a few questions

Where do Estonian's three degrees of length come from? Does every phoneme
have three degrees of length? Aren't there alot of ambiguity since only
short and long - and not so-called 'overlong' too - are indicated in the
orthography?

How did Estonian lose vowel harmony? And how does vowel harmony appear in a
language at all?

Doesn't Vietnamese have eth, and isn't it /D/?

Are there terms similar to 'dual' and 'trial' for numbers four-ten? If so,
what are they?

Thanks

T

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