!name: frame 26.04.1989.
!internal macro: -
               !let n=.0625
                let n=d          !VL 1991/04/26
prism_ 8,c,
0,0,15,
0,b,15,
a,b,15,
a,0,15,
a-n,0,15,
a-n,b-n,15,
n,b-n,15,
n,0,15

end
