This is not form my memory, I don't remember, but my parents told me later that my twin sister and I developed a certain "twin-language" in our early childhood that they could not understand. My father mentioned that I had a word that I repeated over and over, it supposedly soothed or comforted me, as it didn't have any meaning, "koy-koy".
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Another non-English speaking - DX'd at age 38
"Aut viam inveniam aut faciam." (Hannibal) - Latin for "I'll either find a way or make one."