beginfig(1);
u =         0.0833333333 cm;
draw 
     (        0.0000000000u,        0.0000000000u)--
     (      120.0000000000u,        0.0000000000u)--
     (      120.0000000000u,      100.0000000000u)--
     (        0.0000000000u,      100.0000000000u)--cycle;
draw fullcircle
     xscaled         48.0000000000u
     yscaled         48.0000000000u
     shifted (       24.0000000000u,       76.0000000000u);
draw fullcircle
     xscaled         48.0000000000u
     yscaled         48.0000000000u
     shifted (       96.0000000000u,       76.0000000000u);
draw fullcircle
     xscaled         48.0000000000u
     yscaled         48.0000000000u
     shifted (       96.0000000000u,       24.0000000000u);
draw fullcircle
     xscaled         48.0000000000u
     yscaled         48.0000000000u
     shifted (       24.0000000000u,       24.0000000000u);
endfig;
end;