1
2500
4 400 0 8000 400 0 -8000 -400 0 -8000 -400 0 8000 
1
  2c 4 3 0 1 2 
8000
4 400 0 8000 400 0 -8000 -400 0 -8000 -400 0 8000 
1
  2c 4 3 0 1 2 
20000
2 0 0 8000 0 0 -8000 
1
  3 2 0 1 

25000 0
