12 balls names A B C D E F G H I J K L4 Q5 Q2 A; g& o
1St A B C D : E F G H if balance ( j+ u! w3 \9 j* v0 D
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)
! Z- D$ ]% I. P5 Ptvb now,tvbnow,bttvb3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)5 `2 N/ a# f& S" }4 V/ |$ t- [
L is different |