Rule 15 (ZendoGEN 2.2!)

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A     A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A-A     A-A-A     A-A-A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A     A-A-A     A-A     A-A     A-A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A-A     A-A     A-A     A-A-A     A     A     A     A     A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A     A-A     A-A-A     A-A-A     A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A-A     A     A-A-A     A-A     A-A     A-A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A     A-A-A     A-A-A     A-A     A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A-A     A     A-A-A     A     A     A     A     A-A     A-A     A     A-A     A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A-A     A     A-A     A-A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A-A-A     A     A-A     A-A-A     A-A-A     A-A-A     A-A-A     A-A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A     A-A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A-A-A     A-A     A-A     A-A-A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A-A-A     A     A     A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A     A-A-A     A     A-A     A-A     A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A     A-A     A     A-A-A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A     A-A     A     A-A-A     A-A-A     A-A     A-A     A-A     A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A     A-A     A     A     A     A     A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A-A-A     A-A-A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A     A-A-A     A     A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A     A     A-A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A     A-A-A     A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A     A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A-A     A-A     A     A     A-A     A-A-A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A-A     A-A-A     A-A     A-A     A-A     A-A-A     A     A-A     A-A     A-A     A-A-A     A     A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A     A-A-A     A-A-A     A     A-A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A     A     A-A     A-A     A-A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A     A-A     A     A-A     A-A-A     A-A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A-A     A     A-A-A     A     A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A-A     A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A     A-A     A     A     A-A-A     A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A-A-A     A-A-A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A     A-A     A     A-A     A-A-A     A     A-A-A     A-A     A-A     A     A-A-A     A-A     A-A-A     A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A     A-A-A     A     A-A     A-A     A-A-A     A-A     A     A     A-A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A-A-A     A-A     A-A     A-A     A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A     A     A-A-A     A-A     A-A     A-A     A-A-A     A-A-A     A     A     A-A-A     A-A-A     A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A     A-A     A     A     A-A-A     A-A     A     A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A     A-A-A     A-A     A-A     A-A-A     A-A     A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A     A-A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A     A-A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A     A-A     A-A-A     A     A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A     A-A     A     A     A     A-A-A     A-A-A     A-A-A     A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A     A     A-A     A-A     A-A     A-A-A     A-A     A     A     A-A     A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A     A-A     A-A     A-A-A     A-A     A-A-A     A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A-A-A     A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A     A     A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A     A-A     A-A     A-A     A-A     A-A     A     A-A-A     A     A-A-A     A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A     A-A-A     A-A-A     A     A-A     A-A     A-A-A     A-A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A     A     A-A-A     A-A-A     A     A-A     A-A-A     A-A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A     A     A-A-A     A     A-A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A     A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A-A     A-A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A-A     A-A     A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A     A-A     A     A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A     A-A-A     A-A     A-A-A     A-A-A     A-A-A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A     A-A-A     A     A     A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A-A     A     A-A-A     A-A-A     A-A-A     A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A-A-A     A-A-A     A-A     A     A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A     A-A     A-A-A     A-A-A     A-A     A     A-A-A     A-A     A     A     A-A-A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A     A-A     A-A-A     A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A-A     A-A-A     A     A-A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A-A     A-A     A-A     A-A     A-A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A     A-A-A     A     A-A     A-A-A     A-A     A-A-A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A     A-A     A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A     A-A-A     A-A-A     A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A-A     A     A-A-A     A     A     A-A-A     A-A     A-A-A     A     A-A-A     A-A     A     A     A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A-A     A     A-A-A     A-A     A     A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A-A     A-A-A     A-A     A     A     A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A     A-A     A-A     A     A-A     A-A     A-A-A     A     A-A     A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A-A-A     A-A-A     A-A-A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A-A     A-A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A-A     A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A-A     A-A-A     A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A     A-A-A     A     A     A-A-A     A-A     A     A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A-A     A-A-A     A-A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A     A-A     A-A     A-A     A     A-A     A-A-A     A-A-A     A-A-A     A     A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A-A     A-A-A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A     A-A-A     A-A-A     A     A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A     A-A     A-A-A     A-A     A     A-A     A     A     A-A     A     A-A     A-A     A-A-A     A     A-A     A-A     A-A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A     A-A     A-A-A     A     A-A     A     A-A     A-A-A     A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A     A-A     A-A-A     A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A     A-A     A-A     A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A     A-A-A     A-A-A     A-A-A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A     A-A-A     A-A     A-A-A     A-A     A     A-A-A     A-A-A     A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A-A     A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A     A-A-A     A-A-A     A-A-A     A     A     A-A     A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A-A     A     A-A-A     A-A     A     A-A     A     A-A-A     A-A-A     A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A     A     A-A     A-A     A-A     A-A-A     A     A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A-A     A-A-A     A-A-A     A     A-A     A     A-A-A     A     A-A     A-A-A     A     A     A-A-A     A-A     A-A-A     A     A     A-A     A-A-A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A-A-A     A-A-A  

  O --- This koan is YANG (does have the Buddha-nature):     A-A     A     A-A     A     A-A-A     A  

  O --- This koan is YIN (doesn't have the Buddha-nature):     A-A     A     A-A-A     A-A-A     A-A-A     A     A  

  O --- This koan is YANG (does have the Buddha-nature):     A     A-A-A     A-A-A     A     A     A     A-A     A-A