first ot all ,celebrate to two group which have 6 in a group" v/ O, @, ^3 L) C5 H- O" ~# i
and then celebrate again to 3 in a group from which more heaviertvb now,tvbnow,bttvb, W) J3 |9 F# q% S6 X5 _: t3 ?
lastly, take two ping pongs from the heavier group and put in
- O0 f% ]0 ~& y% C. ~tvb now,tvbnow,bttvbwhen there are same quality 5.39.217.77:8898- D; C% U- G2 |( F5 h% y9 h
that's mean the third ping pong is different
) \5 i5 n% X0 G0 U( Z) Q& R" H5 k
( n1 G' Q+ E- W) _i got it in 1 minute |