#B1----------------------------------------------
pcylinder p 10 20
trotate p 0 0 0 0 1 0 90
box bx 5 -5 0 10 10 20
bfuse f p bx
nexplode f f
depouille result f 0 0 1 f_3 5 0 0 20 0 0 1 \
f_7 3 0 0 20 0 0 1

set square 2323.25