Latin tenebrae derivation

From: alexandru_mg3
Message: 62086
Date: 2008-12-15

*tenebrae < *temasra: < *temh-s-reh2

with -ChC- > -CaC-
-sr- > -br-

But why e-a > e-e?
and especially why -m- > -n-?

Thanks,
Marius

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