beginfig(1);
u =         0.0833333333 cm;
draw 
     (        0.0000000000u,        0.0000000000u)--
     (      120.0000000000u,        0.0000000000u)--
     (      120.0000000000u,       80.0000000000u)--
     (        0.0000000000u,       80.0000000000u)--cycle;
draw fullcircle
     xscaled         42.0000000000u
     yscaled         42.0000000000u
     shifted (       21.0000000000u,       59.0000000000u);
draw fullcircle
     xscaled         42.0000000000u
     yscaled         42.0000000000u
     shifted (       39.3735958011u,       21.0000000000u);
draw fullcircle
     xscaled         42.0000000000u
     yscaled         42.0000000000u
     shifted (       99.0000000000u,       37.0574234815u);
draw fullcircle
     xscaled         42.0000000000u
     yscaled         42.0000000000u
     shifted (       63.1865671242u,       59.0000000000u);
endfig;
end;