10000
2
16
500 -500 -500 M
0 1000 0 l
0 0 1000 l
0 -1000 0 l
0 0 -1000 l
-1000 0 0 l
0 1000 0 l
1000 0 0 l
-500 -500 -500 M
0 0 1000 l
1000 0 0 l
-500 -500 500 M
0 1000 0 l
1000 0 0 l
-500 500 500 M
0 0 -1000 l
