YOU SAID:
you don't know what you don't know
INTO JAPANESE
あなたはあなたが知らないことを知らない
BACK INTO ENGLISH
You don't know what you don't know
INTO JAPANESE
あなたはあなたが知らないことを知りません
BACK INTO ENGLISH
You don't know what you don't know
That didn't even make that much sense in English.