YOU SAID:
A friend of a friend is my friend of a friends.
INTO JAPANESE
友達の友達は私の友達の友達です。
BACK INTO ENGLISH
Friend of a friend is a friend of my friend.
INTO JAPANESE
友達の友達は私の友達の友達です。
BACK INTO ENGLISH
Friend of a friend is a friend of my friend.
You've done this before, haven't you.