first ot all ,celebrate to two group which have 6 in a group3 b2 @& |- u' y- Y' Q
and then celebrate again to 3 in a group from which more heavier- M% l6 p: ^9 m
lastly, take two ping pongs from the heavier group and put in
5 e( N+ n3 U; _. c3 K5.39.217.77when there are same quality tvb now,tvbnow,bttvb1 H/ T, I3 }+ W: M3 y
that's mean the third ping pong is different( U% A( D- x. b0 d O g' U
5.39.217.77# u+ B3 b# N: [; a5 h' {3 f
i got it in 1 minute |