12 balls names A B C D E F G H I J K L
7 k. l/ ]/ P% @2 Y; e# c stvb now,tvbnow,bttvb1St A B C D : E F G H if balance tvb now,tvbnow,bttvb2 i5 i3 D5 H& L( \5 B
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)! y- h: Y \- @
3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)
' f# ^/ B" B# r# WL is different |