12 balls names A B C D E F G H I J K Ltvb now,tvbnow,bttvb( o7 Y, ^/ f, H6 V F" N" T$ e* O! X
1St A B C D : E F G H if balance
1 Q1 q! {" a4 V$ Otvb now,tvbnow,bttvb2nd 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)
, ]9 W' Y$ S! k0 n, e) w l3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)
4 z/ R7 ?7 |- G- [5 K: ^; t5 Ftvb now,tvbnow,bttvbL is different |