12 balls names A B C D E F G H I J K L 0 p/ d) X, q2 l4 w5.39.217.771St A B C D : E F G H if balance 公仔箱論壇+ f4 J% F! x: J! N+ g8 N
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): J1 T; H4 j6 {. s& b' b$ R
3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different) & _# k* {; |) l/ ]2 F5.39.217.77L is different