easy, one minutes i solve the problem
! [1 @- L1 |4 ]0 @+ }tvboxnow.comdivide into half, mean 6/ 6
2 K' O. [ k' x6 x @' h5 ]8 y ktvb now,tvbnow,bttvbtake the heavier 6 ping pong
9 x4 T& L9 m+ G( A0 C公仔箱論壇divide into 3/3, take the heavier 3 L) u$ j8 v5 @5 B h
take the the other 3 that have the equal weight, switch each to measure, the most important things is labeling the ping pong so that we can recognize |