12 balls names A B C D E F G H I J K L
4 X$ ~3 @; e6 I4 c- b1St A B C D : E F G H if balance tvb now,tvbnow,bttvb- W& K3 c3 i. ^$ O! F
2nd A B (or either 2 of A-H) : I J if again balance if A B > I J (implies the different is light ball is I or J)
' t+ U \3 S5 }- X G, b3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)
- R6 p6 B% q# N6 }L is different |