first ot all ,celebrate to two group which have 6 in a grouptvb now,tvbnow,bttvb& v# I2 x$ H) H; M1 W0 k7 N
and then celebrate again to 3 in a group from which more heaviertvb now,tvbnow,bttvb: N+ ?' T; g# l5 B& N) b% Y4 X, A: B
lastly, take two ping pongs from the heavier group and put in公仔箱論壇5 M5 ]. L* y9 j' V
when there are same quality
& @& q8 V9 ~3 \9 g6 |6 a8 k5.39.217.76that's mean the third ping pong is different
1 P3 c+ b a3 `! [9 N
' a9 S, T4 i |i got it in 1 minute |