first ot all ,celebrate to two group which have 6 in a group公仔箱論壇# z8 h* T' X5 m2 T
and then celebrate again to 3 in a group from which more heavier
+ |! C/ y. ?6 G- g7 l; i9 V& E4 W2 ^公仔箱論壇lastly, take two ping pongs from the heavier group and put in, M' S4 ]$ b( i. |& I- b8 {
when there are same quality
' I$ f; {. d, U2 K2 _that's mean the third ping pong is different
8 @% W6 w& ~4 O7 P u [% K; z
i got it in 1 minute |