beginfig(1);
u =         0.0625000000 cm;
draw 
     (        0.0000000000u,        0.0000000000u)--
     (      160.0000000000u,        0.0000000000u)--
     (      160.0000000000u,       80.0000000000u)--
     (        0.0000000000u,       80.0000000000u)--cycle;
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (       20.0000000000u,       20.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (      100.0000000000u,       60.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (       60.0000000000u,       20.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (       60.0000000000u,       60.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (      140.0000000000u,       60.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (      140.0000000000u,       20.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (       20.0000000000u,       60.0000000000u);
draw fullcircle
     xscaled         40.0000000000u
     yscaled         40.0000000000u
     shifted (      100.0000000078u,       20.0000000000u);
endfig;
end;