tieren89

first ot all ,celebrate to two group which have 6 in a group5.39.217.77& L; n, k5 t  W
and then celebrate again to 3 in a group from which more heavier9 z0 E% e8 x" L
lastly, take two ping pongs from the heavier group and put in
, O$ [- g  A& s* Y' l' y' awhen there are same quality $ C9 Q6 u( a$ j. m* R
that's mean the third ping pong is different/ j: n) |$ u$ j. b& h' [
公仔箱論壇3 {) Y! C, Z( h6 {' N
i got it in 1 minute