What were the 6 clues that were found in the third floor hallway in the Westing Game?

In the third part of Westing's will it says the heir who wins the windfall will be the one who finds the fourth and 4 character's names are Barney NORTHrup, Sandy McSOUTHers, Julian EASTman, and Samuel WESTing. So, Turtle realizes that Westing was all of this people is disguise. Later, Samuel Westing dies of old age.