beginfig(1);
u =         0.0500000000 cm;
draw 
     (        0.0000000000u,        0.0000000000u)--
     (      100.0000000000u,        0.0000000000u)--
     (      100.0000000000u,      200.0000000000u)--
     (        0.0000000000u,      200.0000000000u)--cycle;
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       25.0000000000u,       75.0000000071u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       75.0000000000u,      175.0000000000u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       25.0000000000u,       25.0000000000u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       25.0000000000u,      175.0000000000u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       75.0000000000u,      125.0000000000u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       75.0000000000u,       25.0000000000u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       25.0000000000u,      125.0000000046u);
draw fullcircle
     xscaled         50.0000000000u
     yscaled         50.0000000000u
     shifted (       75.0000000000u,       75.0000000000u);
endfig;
end;