take 4 balls as a group, 3 groups - A B C 
6 F+ j' j0 h  H0 P. ^9 k1 H% \+ vtvb now,tvbnow,bttvbweigh A & B (ex. B heavier) 
# A! e/ @0 `0 b- G3 lTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。then weigh B & C (B & C same weight)5.39.217.77:8898$ D% ?6 O7 c6 |' G# n- R6 u 
to find which group has the weight difference and find out is it (A is lighter) 
' R6 }7 B+ M' U5 v  |heavier or lighter 
; W0 _5 Q' I" A9 u2 Jthen measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)公仔箱論壇6 K1 m- K1 D  g% g8 z5 k 
measure E vs F to find which 1 is lighter.... |