12 balls names A B C D E F G H I J K L * K+ ]& H- n$ h2 z$ S1St A B C D : E F G H if balance " M) n9 \: H0 j2nd 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) 5 V! J% H1 M( p5 J6 C3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)& M' U( d! Y% Y% _# a- J
L is different