12 balls names A B C D E F G H I J K L
. x5 Q" k# ]4 T* Q/ z5.39.217.761St A B C D : E F G H if balance
( y r% G u4 K+ p6 Ztvb 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)
7 R% u( F9 X; [7 [2 f$ g7 Z, X) g- [3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)
! t( b0 h% _2 D( E9 m* q8 |- bL is different |