Can anyone provide a good reason of this different pattern?
I mean: not *"the Hebrew language is like this*", but, so to say, an
"internal" reason.
--Have nouns tsere-tsere a feature common to all them?
--Have nouns tsere-segol a feature common to all them, a common
denominator?
--Could we, given this and this and this root consonants, know in advance
which pattern (tsere-tsere or tsere-segol) the resulting noun would fit if
both vowel sounds are to be 'e'?