The old French diphthong ei : its development dialectally and in the literary language down to modern times
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The Old French diphthong �??i had two developments, (1) �??i > oi, (2) �??i > ei, (symbolic for ?�). On this basis I have divided the oral diphthong �??i (>oi) from �??i + a nasal, and �??i + 1 mouill??e (from which resulted ei).