mesh
 brick
  numz 2
  zblock 1 2. interval 5
   zblock 2 8. interval 4
  numx 2
   xblock 1 5.0 interval 5
   xblock 2 5.0 interval 5
  numy 2
   yblock 1 10. first size 1. last size .1
   yblock 2 10. first size .1 last size 1.
 end
end
