i find one solution that is similar* r2 I5 V+ {0 V. g2 |6 X. u
but i can't specify the heavier one is abnormal or the lighter one is abnormal when the case that has only two balls left....
$ T! \; ]( S4 s) Ktvb now,tvbnow,bttvbmaybe there is a better one, let me see sin |