first ot all ,celebrate to two group which have 6 in a group! V2 U( v# B8 l9 z
and then celebrate again to 3 in a group from which more heaviertvb now,tvbnow,bttvb! ^7 b2 f1 V. R n0 r
lastly, take two ping pongs from the heavier group and put intvb now,tvbnow,bttvb3 K; j% _4 B5 |& g* G; b& G* P
when there are same quality
4 R4 [" U! Q; F+ ]; n% m4 Mthat's mean the third ping pong is different
% G H$ n5 f# P7 P' B7 [) Y5.39.217.77:8898( y. i3 S/ g1 @ }# |) T
i got it in 1 minute |