tieren89

first ot all ,celebrate to two group which have 6 in a group# y. C0 L% N' i& x2 k
and then celebrate again to 3 in a group from which more heavier
" A3 D* j/ J! @# R0 Vlastly, take two ping pongs from the heavier group and put in公仔箱論壇: M& E, v% ?$ q$ A  Z/ [4 I* \# c
when there are same quality $ V( R+ ~$ f$ U
that's mean the third ping pong is different" S- m6 P9 y% r% o7 q' }/ W
0 E) K5 a5 v7 ~& ~! b
i got it in 1 minute