suppose you have 4 coins one of which is faek. The fake coin has a different weight than the real coins but you do not know if it's heavier or...

suppose you have 4 coins one of which is faek. The fake coin has a different weight than the real coins but you do not know if it's heavier or lighter than the real coins. You also have another set of 4 coins which you know are real. determine which coin is fake that requires 2 weighins in a non adaptive solution