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Sidonius lengthens the penultimate vowel
in Abraham, while Arator shortens it.

Word:

first

Question:

Why does Sidonius lengthen the penultimate vowel in Abraham while Arator shortens it?

Answer (optional):

Sidonius lengthens the penultimate vowel in Abraham while Arator shortens it because foreign or barbarous words introduced into the Latin language are not subject to any invariable rule.