YOU SAID:
I know that she knows that I know that she knows that I know that she knows that I know that natural language may be practically regular, rather than merely context insensitive.
INTO JAPANESE
私は彼女が私が知っていることを知っていることを知っていることを知っています。
BACK INTO ENGLISH
I know she knows what I know.
INTO JAPANESE
私は彼女が私が知っていることを知っていることを知っています。
BACK INTO ENGLISH
I know she knows what I know.
That's deep, man.