(-1,0,1)
/ x# v7 I( X! R( U- P0 v) I(-2,0,2)
; k' q5 K5 A# c4 \, h7 I* N(-3,0,3)! w8 Y% R# \$ d# p+ p/ e5 Y
...........
" W( |2 q6 k4 }! b- {8 t1 b% Etvb now,tvbnow,bttvb...........- P' ^, _- W( R5 t; y! [8 t
(-n,0,n)* _; l' A# _. |3 e: w4 l1 ^9 |. \
以上咁多組都得 |