OFF
11 7 0
# vertices
 -1 -1  1
 -1  1  1
  1  1  1
  1 -1  1
 -1 -1 -1
 -1  1 -1
  1  1 -1
  1 -1 -1
  2  2  2
  3  2  2
  3  3  3
  
# facets
  3  3 2 1
  3  3 1 0
  4  0 1 5 4
  4  6 5 1 2
  4  3 7 6 2
  4  4 7 3 0
  4  4 5 6 7
  3  8 9 10