Amarna letters
The Amarna letters are unusual in Egyptological research , because they are mostly written in a script known as Akkadian cuneiform , the writing system of ancient Mesopotamia , rather than that of ancient Egypt , and the language used has sometimes been characterised as a mixed language , Canaanite-Akkadian . 
<triplet> Amarna letters <subj> cuneiform <obj> writing system <triplet> Akkadian <subj> cuneiform <obj> writing system